diff --git a/maigret/activation.py b/maigret/activation.py
index 1adb52f2..2fb3e232 100644
--- a/maigret/activation.py
+++ b/maigret/activation.py
@@ -2,36 +2,44 @@ import json
 from http.cookiejar import MozillaCookieJar
 from http.cookies import Morsel
 
-from aiohttp import CookieJar
+from aiohttp import ClientSession, CookieJar
 
 
 class ParsingActivator:
     @staticmethod
-    def twitter(site, logger, cookies={}, **kwargs):
+    async def twitter(site, logger, cookies={}, **kwargs):
         headers = dict(site.headers)
-        del headers["x-guest-token"]
-        import requests
+        headers.pop("x-guest-token", None)
 
-        r = requests.post(site.activation["url"], headers=headers)
-        logger.info(r)
-        j = r.json()
+        async with ClientSession(trust_env=True) as session:
+            async with session.post(
+                site.activation["url"],
+                headers=headers,
+                timeout=kwargs.get("timeout"),
+            ) as response:
+                logger.info(response)
+                j = await response.json(content_type=None)
         guest_token = j[site.activation["src"]]
-        site.headers["x-guest-token"] = guest_token
+        site.headers[site.activation.get("dst", "x-guest-token")] = guest_token
 
     @staticmethod
-    def vimeo(site, logger, cookies={}, **kwargs):
+    async def vimeo(site, logger, cookies={}, **kwargs):
         headers = dict(site.headers)
-        if "Authorization" in headers:
-            del headers["Authorization"]
-        import requests
+        headers.pop("Authorization", None)
 
-        r = requests.get(site.activation["url"], headers=headers)
-        logger.debug(f"Vimeo viewer activation: {json.dumps(r.json(), indent=4)}")
-        jwt_token = r.json()["jwt"]
+        async with ClientSession(trust_env=True) as session:
+            async with session.get(
+                site.activation["url"],
+                headers=headers,
+                timeout=kwargs.get("timeout"),
+            ) as response:
+                payload = await response.json(content_type=None)
+        logger.debug(f"Vimeo viewer activation: {json.dumps(payload, indent=4)}")
+        jwt_token = payload["jwt"]
         site.headers["Authorization"] = "jwt " + jwt_token
 
     @staticmethod
-    def onlyfans(site, logger, url=None, **kwargs):
+    async def onlyfans(site, logger, url=None, **kwargs):
         # Signing rules (static_param / checksum_indexes / checksum_constant / format / app_token)
         # live in data.json under OnlyFans.activation and rotate upstream every ~1–3 weeks.
         # If "Please refresh the page" keeps firing after activation, refresh them from:
@@ -41,8 +49,6 @@ class ParsingActivator:
         import time as _time
         from urllib.parse import urlparse
 
-        import requests
-
         act = site.activation
         static_param = act["static_param"]
         indexes = act["checksum_indexes"]
@@ -69,11 +75,21 @@ class ParsingActivator:
             hdrs["time"] = t
             hdrs["sign"] = sg
             hdrs.pop("cookie", None)
-            r = requests.get(init_url, headers=hdrs, timeout=15)
-            jar = "; ".join(f"{k}={v}" for k, v in r.cookies.items())
+            async with ClientSession(trust_env=True) as session:
+                async with session.get(
+                    init_url,
+                    headers=hdrs,
+                    timeout=kwargs.get("timeout", 15),
+                ) as response:
+                    jar = "; ".join(
+                        f"{k}={getattr(v, 'value', v)}"
+                        for k, v in response.cookies.items()
+                    )
             if jar:
                 site.headers["cookie"] = jar
-                logger.debug(f"OnlyFans init: got cookies {list(r.cookies.keys())}")
+                logger.debug(
+                    f"OnlyFans init: got cookies {list(response.cookies.keys())}"
+                )
 
         target_path = urlparse(url).path if url else urlparse(init_url).path
         t, sg = _sign(target_path)
@@ -82,38 +98,46 @@ class ParsingActivator:
         logger.debug(f"OnlyFans signed {target_path} time={t}")
 
     @staticmethod
-    def weibo(site, logger, **kwargs):
+    async def weibo(site, logger, **kwargs):
         headers = dict(site.headers)
-        import requests
+        timeout = kwargs.get("timeout")
 
-        session = requests.Session()
-        # 1 stage: get the redirect URL
-        r = session.get(
-            "https://weibo.com/clairekuo", headers=headers, allow_redirects=False
-        )
-        logger.debug(
-            f"1 stage: {'success' if r.status_code == 302 else 'no 302 redirect, fail!'}"
-        )
-        location = r.headers.get("Location", "")
+        async with ClientSession(trust_env=True) as session:
+            # 1 stage: get the redirect URL
+            async with session.get(
+                "https://weibo.com/clairekuo",
+                headers=headers,
+                allow_redirects=False,
+                timeout=timeout,
+            ) as response:
+                logger.debug(
+                    f"1 stage: {'success' if response.status == 302 else 'no 302 redirect, fail!'}"
+                )
+                location = response.headers.get("Location", "")
 
-        # 2 stage: go to passport visitor page
-        headers["Referer"] = location
-        r = session.get(location, headers=headers)
-        logger.debug(
-            f"2 stage: {'success' if r.status_code == 200 else 'no 200 response, fail!'}"
-        )
+            # 2 stage: go to passport visitor page
+            headers["Referer"] = location
+            async with session.get(
+                location,
+                headers=headers,
+                timeout=timeout,
+            ) as response:
+                logger.debug(
+                    f"2 stage: {'success' if response.status == 200 else 'no 200 response, fail!'}"
+                )
 
-        # 3 stage: gen visitor token
-        headers["Referer"] = location
-        r = session.post(
-            "https://passport.weibo.com/visitor/genvisitor2",
-            headers=headers,
-            data={'cb': 'visitor_gray_callback', 'tid': '', 'from': 'weibo'},
-        )
-        cookies = r.headers.get('set-cookie')
-        logger.debug(
-            f"3 stage: {'success' if r.status_code == 200 and cookies else 'no 200 response and cookies, fail!'}"
-        )
+            # 3 stage: gen visitor token
+            headers["Referer"] = location
+            async with session.post(
+                "https://passport.weibo.com/visitor/genvisitor2",
+                headers=headers,
+                data={'cb': 'visitor_gray_callback', 'tid': '', 'from': 'weibo'},
+                timeout=timeout,
+            ) as response:
+                cookies = response.headers.get('set-cookie')
+                logger.debug(
+                    f"3 stage: {'success' if response.status == 200 and cookies else 'no 200 response and cookies, fail!'}"
+                )
         site.headers["Cookie"] = cookies
 
 
diff --git a/maigret/checking.py b/maigret/checking.py
index b47267de..51b914c1 100644
--- a/maigret/checking.py
+++ b/maigret/checking.py
@@ -628,6 +628,13 @@ class CheckerMock:
         return
 
 
+def make_protocol_checker(options: QueryOptions, protocol: str):
+    checker_factory = options["checkers"][protocol]
+    if callable(checker_factory):
+        return checker_factory()
+    return checker_factory
+
+
 def debug_response_logging(url, html_text, status_code, check_error):
     with open("debug.log", "a") as f:
         status = status_code or "No response"
@@ -681,29 +688,6 @@ def process_site_result(
             status_code,
         )
 
-    # parsing activation
-    is_need_activation = any(
-        [s for s in site.activation.get("marks", []) if s in html_text]
-    )
-
-    if site.activation and html_text and is_need_activation:
-        logger.debug(f"Activation for {site.name}")
-        method = site.activation["method"]
-        try:
-            activate_fun = getattr(ParsingActivator(), method)
-            # TODO: async call
-            activate_fun(site, logger)
-        except AttributeError as e:
-            logger.warning(
-                f"Activation method {method} for site {site.name} not found!",
-                exc_info=True,
-            )
-        except Exception as e:
-            logger.warning(
-                f"Failed activation {method} for site {site.name}: {str(e)}",
-                exc_info=True,
-            )
-
     site_name = site.pretty_name
     # presense flags
     # True by default
@@ -889,9 +873,9 @@ def make_site_result(
             f"Site {site.name} requires TLS impersonation (curl_cffi) but it's not installed. "
             "Install with: pip install curl_cffi"
         )
-        checker = options["checkers"][site.protocol]
+        checker = make_protocol_checker(options, site.protocol)
     else:
-        checker = options["checkers"][site.protocol]
+        checker = make_protocol_checker(options, site.protocol)
 
     # site check is disabled
     if site.disabled and not options['forced']:
@@ -1024,8 +1008,13 @@ async def check_site_for_username(
             method = act["method"]
             try:
                 activate_fun = getattr(ParsingActivator(), method)
-                activate_fun(site, logger, url=checker.url)
-            except AttributeError as e:
+                await activate_fun(
+                    site,
+                    logger,
+                    url=checker.url,
+                    timeout=options['timeout'],
+                )
+            except AttributeError:
                 logger.warning(
                     f"Activation method {method} for site {site.name} not found!",
                     exc_info=True,
@@ -1152,31 +1141,32 @@ async def maigret(
         logger.debug(f"Using cookies jar file {cookies}")
         cookie_jar = import_aiohttp_cookies(cookies)
 
-    clearweb_checker = SimpleAiohttpChecker(
-        proxy=proxy, cookie_jar=cookie_jar, logger=logger, dns_resolver=dns_resolver
-    )
+    def clearweb_checker():
+        return SimpleAiohttpChecker(
+            proxy=proxy, cookie_jar=cookie_jar, logger=logger, dns_resolver=dns_resolver
+        )
 
-    # TODO
-    tor_checker = CheckerMock()
-    if tor_proxy:
-        tor_checker = ProxiedAiohttpChecker(  # type: ignore
+    def tor_checker():
+        if not tor_proxy:
+            return CheckerMock()
+        return ProxiedAiohttpChecker(  # type: ignore
             proxy=tor_proxy, cookie_jar=cookie_jar, logger=logger, dns_resolver=dns_resolver
         )
 
-    # TODO
-    i2p_checker = CheckerMock()
-    if i2p_proxy:
-        i2p_checker = ProxiedAiohttpChecker(  # type: ignore
+    def i2p_checker():
+        if not i2p_proxy:
+            return CheckerMock()
+        return ProxiedAiohttpChecker(  # type: ignore
             proxy=i2p_proxy, cookie_jar=cookie_jar, logger=logger, dns_resolver=dns_resolver
         )
 
-    # TODO
-    dns_checker = CheckerMock()
-    if check_domains:
-        dns_checker = AiodnsDomainResolver(logger=logger)  # type: ignore
+    def dns_checker():
+        if not check_domains:
+            return CheckerMock()
+        return AiodnsDomainResolver(logger=logger)  # type: ignore
 
     if logger.level == logging.DEBUG:
-        await debug_ip_request(clearweb_checker, logger)
+        await debug_ip_request(clearweb_checker(), logger)
 
     # setup parallel executor
     executor = AsyncioQueueGeneratorExecutor(
@@ -1265,12 +1255,9 @@ async def maigret(
                     all_results.update([result])
                     progress()
         except asyncio.CancelledError:
-            # Tear down HTTP sessions and re-raise so the caller's
-            # `except CancelledError` runs. The partial `all_results` is
-            # already visible to the caller via the output_container kwarg.
-            await clearweb_checker.close()
-            await tor_checker.close()
-            await i2p_checker.close()
+            # Re-raise so the caller's `except CancelledError` runs. The
+            # partial `all_results` is already visible to the caller via the
+            # output_container kwarg.
             query_notify.finish()
             raise
 
@@ -1288,11 +1275,6 @@ async def maigret(
                 f'Restarting checks for {len(sites)} sites... ({attempts} attempts left)'
             )
 
-    # closing http client session
-    await clearweb_checker.close()
-    await tor_checker.close()
-    await i2p_checker.close()
-
     # notify caller that all queries are finished
     query_notify.finish()
 
diff --git a/tests/test_activation.py b/tests/test_activation.py
index 76e60f47..82c2cb7d 100644
--- a/tests/test_activation.py
+++ b/tests/test_activation.py
@@ -1,6 +1,6 @@
 """Maigret activation test functions"""
 
-import json
+import inspect
 import yarl
 
 import aiohttp
@@ -27,11 +27,12 @@ localhost	FALSE	/	FALSE	0	a	b
 
 @pytest.mark.skip("captcha")
 @pytest.mark.slow
-def test_vimeo_activation(default_db):
+@pytest.mark.asyncio
+async def test_vimeo_activation(default_db):
     vimeo_site = default_db.sites_dict['Vimeo']
     token1 = vimeo_site.headers['Authorization']
 
-    ParsingActivator.vimeo(vimeo_site, Mock())
+    await ParsingActivator.vimeo(vimeo_site, Mock())
     token2 = vimeo_site.headers['Authorization']
 
     assert token1 != token2
@@ -60,6 +61,7 @@ async def test_import_aiohttp_cookies(cookie_test_server):
 
 # ---- OnlyFans signing tests (pure-compute, no network) ----
 
+
 class _FakeSite:
     """Minimal stand-in for MaigretSite with the attributes onlyfans() touches."""
 
@@ -75,23 +77,79 @@ class _FakeSite:
 
 
 class _FakeResponse:
-    def __init__(self, cookies=None):
-        self.cookies = cookies or {}
+    def __init__(self, cookies=None, json_data=None):
+        self.cookies = {
+            key: type("Cookie", (), {"value": value})()
+            for key, value in (cookies or {}).items()
+        }
+        self._json_data = json_data or {}
+
+    async def __aenter__(self):
+        return self
+
+    async def __aexit__(self, exc_type, exc, tb):
+        return False
+
+    async def json(self, content_type=None):
+        return self._json_data
 
 
-def test_onlyfans_sets_xbc_when_zero(monkeypatch):
+@pytest.mark.parametrize("method", ["twitter", "vimeo", "onlyfans", "weibo"])
+def test_activation_methods_are_coroutines(method):
+    assert inspect.iscoroutinefunction(getattr(ParsingActivator, method))
+
+
+@pytest.mark.asyncio
+async def test_vimeo_activation_uses_aiohttp(monkeypatch):
+    site = _FakeSite(
+        headers={"Authorization": "old-token", "User-Agent": "test"},
+        activation={"url": "https://vimeo.test/viewer"},
+    )
+    captured = {}
+
+    class FakeSession:
+        def __init__(self, **kwargs):
+            captured["session_kwargs"] = kwargs
+
+        async def __aenter__(self):
+            return self
+
+        async def __aexit__(self, exc_type, exc, tb):
+            return False
+
+        def get(self, url, headers=None, timeout=None):
+            captured["url"] = url
+            captured["headers"] = dict(headers or {})
+            captured["timeout"] = timeout
+            return _FakeResponse(json_data={"jwt": "fresh"})
+
+    monkeypatch.setattr("maigret.activation.ClientSession", FakeSession)
+
+    await ParsingActivator.vimeo(site, Mock(), timeout=7)
+
+    assert captured["url"] == "https://vimeo.test/viewer"
+    assert captured["headers"] == {"User-Agent": "test"}
+    assert captured["timeout"] == 7
+    assert captured["session_kwargs"] == {"trust_env": True}
+    assert site.headers["Authorization"] == "jwt fresh"
+
+
+@pytest.mark.asyncio
+async def test_onlyfans_sets_xbc_when_zero(monkeypatch):
     site = _FakeSite(headers={"x-bc": "0", "cookie": "existing=1"})
 
-    # Prevent any real network. If _sign path still fires requests.get, fail loudly.
-    import maigret.activation as act_mod
-
+    # Prevent any real network. If _sign path still opens a session, fail loudly.
     def boom(*a, **kw):  # pragma: no cover - sanity
-        raise AssertionError("requests.get should not run when cookie is present")
+        raise AssertionError("ClientSession should not open when cookie is present")
 
-    monkeypatch.setattr(act_mod.__dict__.get("requests", None) or __import__("requests"), "get", boom, raising=False)
+    monkeypatch.setattr("maigret.activation.ClientSession", boom)
 
     logger = Mock()
-    ParsingActivator.onlyfans(site, logger, url="https://onlyfans.com/api2/v2/users/adam")
+    await ParsingActivator.onlyfans(
+        site,
+        logger,
+        url="https://onlyfans.com/api2/v2/users/adam",
+    )
 
     # x-bc must be rewritten to a non-zero hex token
     assert site.headers["x-bc"] != "0"
@@ -101,26 +159,42 @@ def test_onlyfans_sets_xbc_when_zero(monkeypatch):
     assert site.headers["sign"].startswith("57203:")
 
 
-def test_onlyfans_fetches_init_cookie_when_missing(monkeypatch):
+@pytest.mark.asyncio
+async def test_onlyfans_fetches_init_cookie_when_missing(monkeypatch):
     """When cookie header is absent, init endpoint is called and its cookies stored."""
     site = _FakeSite(headers={"x-bc": "already_set_token", "user-id": "0"})
 
-    import requests
-
     captured = {}
 
-    def fake_get(url, headers=None, timeout=15):
-        captured["url"] = url
-        captured["headers"] = dict(headers or {})
-        return _FakeResponse(cookies={"sess": "abc123", "csrf": "xyz"})
+    class FakeSession:
+        def __init__(self, **kwargs):
+            captured["session_kwargs"] = kwargs
 
-    monkeypatch.setattr(requests, "get", fake_get)
+        async def __aenter__(self):
+            return self
+
+        async def __aexit__(self, exc_type, exc, tb):
+            return False
+
+        def get(self, url, headers=None, timeout=15):
+            captured["url"] = url
+            captured["headers"] = dict(headers or {})
+            captured["timeout"] = timeout
+            return _FakeResponse(cookies={"sess": "abc123", "csrf": "xyz"})
+
+    monkeypatch.setattr("maigret.activation.ClientSession", FakeSession)
 
     logger = Mock()
-    ParsingActivator.onlyfans(site, logger, url="https://onlyfans.com/api2/v2/users/adam")
+    await ParsingActivator.onlyfans(
+        site,
+        logger,
+        url="https://onlyfans.com/api2/v2/users/adam",
+    )
 
     # init request made
     assert captured["url"] == site.activation["url"]
+    assert captured["timeout"] == 15
+    assert captured["session_kwargs"] == {"trust_env": True}
     # headers passed to init include freshly generated time/sign
     assert "time" in captured["headers"]
     assert captured["headers"]["sign"].startswith("57203:")
@@ -128,38 +202,59 @@ def test_onlyfans_fetches_init_cookie_when_missing(monkeypatch):
     assert site.headers["cookie"] == "sess=abc123; csrf=xyz"
 
 
-def test_onlyfans_signature_is_deterministic_for_same_time(monkeypatch):
+@pytest.mark.asyncio
+async def test_onlyfans_signature_is_deterministic_for_same_time(monkeypatch):
     """Two calls with patched time produce identical signatures."""
     site1 = _FakeSite(headers={"x-bc": "token", "cookie": "c=1"})
     site2 = _FakeSite(headers={"x-bc": "token", "cookie": "c=1"})
 
     import maigret.activation
+
     monkeypatch.setattr(maigret.activation, "_time", __import__("time"), raising=False)
 
     fixed = 1_700_000_000.123
     import time as time_mod
+
     monkeypatch.setattr(time_mod, "time", lambda: fixed)
 
     logger = Mock()
-    ParsingActivator.onlyfans(site1, logger, url="https://onlyfans.com/api2/v2/users/adam")
-    ParsingActivator.onlyfans(site2, logger, url="https://onlyfans.com/api2/v2/users/adam")
+    await ParsingActivator.onlyfans(
+        site1,
+        logger,
+        url="https://onlyfans.com/api2/v2/users/adam",
+    )
+    await ParsingActivator.onlyfans(
+        site2,
+        logger,
+        url="https://onlyfans.com/api2/v2/users/adam",
+    )
 
     assert site1.headers["time"] == site2.headers["time"]
     assert site1.headers["sign"] == site2.headers["sign"]
 
 
-def test_onlyfans_sign_differs_per_path(monkeypatch):
+@pytest.mark.asyncio
+async def test_onlyfans_sign_differs_per_path(monkeypatch):
     """Different target URLs must yield different signatures."""
     site = _FakeSite(headers={"x-bc": "token", "cookie": "c=1"})
 
     import time as time_mod
+
     monkeypatch.setattr(time_mod, "time", lambda: 1_700_000_000.0)
 
     logger = Mock()
-    ParsingActivator.onlyfans(site, logger, url="https://onlyfans.com/api2/v2/users/adam")
+    await ParsingActivator.onlyfans(
+        site,
+        logger,
+        url="https://onlyfans.com/api2/v2/users/adam",
+    )
     sig_adam = site.headers["sign"]
 
-    ParsingActivator.onlyfans(site, logger, url="https://onlyfans.com/api2/v2/users/bob")
+    await ParsingActivator.onlyfans(
+        site,
+        logger,
+        url="https://onlyfans.com/api2/v2/users/bob",
+    )
     sig_bob = site.headers["sign"]
 
     assert sig_adam != sig_bob
diff --git a/tests/test_checking.py b/tests/test_checking.py
index 92eaa954..f7db4f70 100644
--- a/tests/test_checking.py
+++ b/tests/test_checking.py
@@ -1,9 +1,11 @@
+import asyncio
 from argparse import ArgumentTypeError
 
 from mock import Mock
 import pytest
 
 from maigret import search
+from maigret.activation import ParsingActivator
 from maigret.checking import (
     extract_ids_data,
     parse_usernames,
@@ -12,6 +14,7 @@ from maigret.checking import (
     timeout_check,
     debug_response_logging,
     process_site_result,
+    check_site_for_username,
 )
 from maigret.error_detection import ErrorPageDetector
 from maigret.errors import CheckError
@@ -390,6 +393,178 @@ def test_process_site_result_error_context_uses_instance():
     assert "class" not in out["status"].context
 
 
+@pytest.mark.asyncio
+async def test_check_site_for_username_awaits_activation_before_retry(monkeypatch):
+    site = _make_site({
+        "checkType": "status_code",
+        "headers": {"X-Initial": "1"},
+        "activation": {
+            "method": "test_async",
+            "marks": ["NEEDS_ACTIVATION"],
+        },
+        "protocol": "https",
+    })
+
+    class FakeChecker:
+        def __init__(self):
+            self.calls = 0
+            self.prepared_headers = []
+            self.url = None
+            self.headers = None
+            self.allow_redirects = True
+            self.timeout = 0
+            self.method = "get"
+            self.payload = None
+
+        def prepare(
+            self,
+            url,
+            headers=None,
+            allow_redirects=True,
+            timeout=0,
+            method="get",
+            payload=None,
+        ):
+            self.url = url
+            self.headers = headers
+            self.allow_redirects = allow_redirects
+            self.timeout = timeout
+            self.method = method
+            self.payload = payload
+            self.prepared_headers.append(dict(headers or {}))
+            return None
+
+        async def check(self):
+            self.calls += 1
+            if self.calls == 1:
+                return "NEEDS_ACTIVATION", 200, None
+            return "activated", 200, None
+
+    async def activate(site, logger, **kwargs):
+        await asyncio.sleep(0)
+        site.headers["X-Activated"] = "yes"
+
+    checker = FakeChecker()
+    monkeypatch.setattr(
+        ParsingActivator,
+        "test_async",
+        staticmethod(activate),
+        raising=False,
+    )
+
+    options = {
+        "parsing": False,
+        "cookie_jar": None,
+        "forced": True,
+        "id_type": "username",
+        "timeout": 3,
+        "proxy": None,
+        "checkers": {"https": checker},
+    }
+
+    _, result = await check_site_for_username(
+        site,
+        "a",
+        options,
+        Mock(),
+        Mock(),
+    )
+
+    assert checker.calls == 2
+    assert checker.prepared_headers[-1]["X-Activated"] == "yes"
+    assert result["status"].status == MaigretCheckStatus.CLAIMED
+
+
+@pytest.mark.asyncio
+async def test_concurrent_activation_uses_independent_checkers(monkeypatch):
+    instances = []
+
+    class FakeChecker:
+        def __init__(self):
+            self.calls = 0
+            self.prepared_urls = []
+            self.url = None
+            self.headers = None
+            self.allow_redirects = True
+            self.timeout = 0
+            self.method = "get"
+            self.payload = None
+            instances.append(self)
+
+        def prepare(
+            self,
+            url,
+            headers=None,
+            allow_redirects=True,
+            timeout=0,
+            method="get",
+            payload=None,
+        ):
+            self.url = url
+            self.headers = headers
+            self.allow_redirects = allow_redirects
+            self.timeout = timeout
+            self.method = method
+            self.payload = payload
+            self.prepared_urls.append(url)
+            return None
+
+        async def check(self):
+            await asyncio.sleep(0)
+            self.calls += 1
+            if self.calls == 1:
+                return "NEEDS_ACTIVATION", 200, None
+            return "activated", 200, None
+
+    async def activate(site, logger, **kwargs):
+        await asyncio.sleep(0)
+        site.headers["X-Activated"] = site.name
+
+    monkeypatch.setattr(
+        ParsingActivator,
+        "test_async",
+        staticmethod(activate),
+        raising=False,
+    )
+
+    options = {
+        "parsing": False,
+        "cookie_jar": None,
+        "forced": True,
+        "id_type": "username",
+        "timeout": 3,
+        "proxy": None,
+        "checkers": {"https": FakeChecker},
+    }
+    first = _make_site({
+        "url": "https://x/one/{username}",
+        "urlMain": "https://x",
+        "checkType": "status_code",
+        "activation": {"method": "test_async", "marks": ["NEEDS_ACTIVATION"]},
+        "protocol": "https",
+    })
+    first.name = "First"
+    second = _make_site({
+        "url": "https://x/two/{username}",
+        "urlMain": "https://x",
+        "checkType": "status_code",
+        "activation": {"method": "test_async", "marks": ["NEEDS_ACTIVATION"]},
+        "protocol": "https",
+    })
+    second.name = "Second"
+
+    await asyncio.gather(
+        check_site_for_username(first, "a", options, Mock(), Mock()),
+        check_site_for_username(second, "a", options, Mock(), Mock()),
+    )
+
+    assert len(instances) == 2
+    assert [checker.prepared_urls for checker in instances] == [
+        ["https://x/one/a", "https://x/one/a"],
+        ["https://x/two/a", "https://x/two/a"],
+    ]
+
+
 # ---- CurlCffiChecker: TLS impersonation header sanitisation ----