diff --git a/app/features/friends/FriendRepository.server.ts b/app/features/friends/FriendRepository.server.ts
index 1ad6425da..64a185bb7 100644
--- a/app/features/friends/FriendRepository.server.ts
+++ b/app/features/friends/FriendRepository.server.ts
@@ -187,7 +187,7 @@ export async function findFriendRequestBetween({
 }) {
 	return db
 		.selectFrom("FriendRequest")
-		.select("FriendRequest.id")
+		.select(["FriendRequest.id", "FriendRequest.senderId"])
 		.where((eb) =>
 			eb.or([
 				eb.and([
diff --git a/app/features/user-card/components/UserCard.tsx b/app/features/user-card/components/UserCard.tsx
index 91affe56d..d95d9f661 100644
--- a/app/features/user-card/components/UserCard.tsx
+++ b/app/features/user-card/components/UserCard.tsx
@@ -253,7 +253,8 @@ function CardContent({
 						{friendship && !friendship.isFriend ? (
 							<FriendRequestButton
 								targetUserId={data.id}
-								hasPendingFriendRequest={friendship.hasPendingFriendRequest}
+								sentFriendRequest={friendship.sentFriendRequest}
+								incomingFriendRequestId={friendship.incomingFriendRequestId}
 							/>
 						) : null}
 						<SendouButton
@@ -369,42 +370,69 @@ function NoteView({
 }
 
 /**
- * Send friend request action on the card. Submits to the `/friends` route action and shows a
- * checkmark once a request is pending (server-known or just sent). Cancelling a pending request
- * is done on the `/friends` page.
+ * Friend request action on the card, submitting to the `/friends` route action. Normally sends a
+ * request and shows a checkmark once one is pending (server-known or just sent); when the shown
+ * user has already sent the viewer a request, the same add-friend press accepts it instead.
+ * Cancelling a pending request is done on the `/friends` page.
  */
 function FriendRequestButton({
 	targetUserId,
-	hasPendingFriendRequest,
+	sentFriendRequest,
+	incomingFriendRequestId,
 }: {
 	targetUserId: number;
-	hasPendingFriendRequest: boolean;
+	sentFriendRequest: boolean;
+	incomingFriendRequestId: number | null;
 }) {
 	const { t } = useTranslation(["user"]);
 	const fetcher = useFetcher();
 	const previousStateRef = React.useRef(fetcher.state);
+	const acceptsIncomingRequest = incomingFriendRequestId !== null;
 
+	// fires on the submitting -> revalidating transition (not on idle) so the accepted toast still
+	// shows before the revalidated friendship data unmounts this button
 	React.useEffect(() => {
 		if (
-			previousStateRef.current !== "idle" &&
-			fetcher.state === "idle" &&
+			previousStateRef.current === "submitting" &&
+			fetcher.state !== "submitting" &&
 			fetcher.data === null
 		) {
 			toastQueue.add(
 				{
-					message: t("user:card.friendRequestSent"),
+					message: acceptsIncomingRequest
+						? "Friend request accepted"
+						: t("user:card.friendRequestSent"),
 					variant: "success",
 				},
 				{ timeout: 5000 },
 			);
 		}
 		previousStateRef.current = fetcher.state;
-	}, [fetcher.state, fetcher.data, t]);
+	}, [fetcher.state, fetcher.data, acceptsIncomingRequest, t]);
+
+	if (acceptsIncomingRequest) {
+		return (
+			<SendouButton
+				size="miniscule"
+				shape="circle"
+				icon={<UserPlus />}
+				isDisabled={fetcher.state !== "idle" || fetcher.data === null}
+				aria-label="Accept friend request"
+				onPress={() =>
+					fetcher.submit(
+						{
+							_action: "ACCEPT_REQUEST",
+							friendRequestId: incomingFriendRequestId,
+						},
+						{ method: "post", action: FRIENDS_PAGE },
+					)
+				}
+			/>
+		);
+	}
 
 	const requestPending =
-		hasPendingFriendRequest ||
-		fetcher.state !== "idle" ||
-		fetcher.data === null;
+		sentFriendRequest || fetcher.state !== "idle" || fetcher.data === null;
 
 	if (requestPending) {
 		return (
diff --git a/app/features/user-card/routes/user-card.$id.friendship.ts b/app/features/user-card/routes/user-card.$id.friendship.ts
index fa2f88556..7355f3006 100644
--- a/app/features/user-card/routes/user-card.$id.friendship.ts
+++ b/app/features/user-card/routes/user-card.$id.friendship.ts
@@ -23,7 +23,8 @@ export const loader = async ({
 	if (!viewer || Number.isNaN(targetUserId)) {
 		return {
 			isFriend: false,
-			hasPendingFriendRequest: false,
+			sentFriendRequest: false,
+			incomingFriendRequestId: null,
 			mutualFriends: [],
 		};
 	}
@@ -50,7 +51,11 @@ export const loader = async ({
 
 	return {
 		isFriend: Boolean(friendship),
-		hasPendingFriendRequest: Boolean(pendingRequest),
+		sentFriendRequest: pendingRequest?.senderId === viewer.id,
+		incomingFriendRequestId:
+			pendingRequest && pendingRequest.senderId !== viewer.id
+				? pendingRequest.id
+				: null,
 		mutualFriends,
 	};
 };
diff --git a/app/features/user-card/user-card-types.ts b/app/features/user-card/user-card-types.ts
index be89b31cc..232e8b58f 100644
--- a/app/features/user-card/user-card-types.ts
+++ b/app/features/user-card/user-card-types.ts
@@ -25,8 +25,10 @@ export interface UserCardData extends CommonUser {
  */
 export interface UserCardFriendship {
 	isFriend: boolean;
-	/** Whether a friend request between the viewer and this user is currently pending. */
-	hasPendingFriendRequest: boolean;
+	/** Whether the viewer has a pending friend request sent to this user. */
+	sentFriendRequest: boolean;
+	/** Id of this user's pending friend request to the viewer, or `null` when there is none. */
+	incomingFriendRequestId: number | null;
 	mutualFriends: Array<CommonUser>;
 }
 
diff --git a/e2e/user-card.spec.ts b/e2e/user-card.spec.ts
index 69d7112c6..5cdfed59b 100644
--- a/e2e/user-card.spec.ts
+++ b/e2e/user-card.spec.ts
@@ -1,12 +1,15 @@
+import { NZAP_TEST_ID } from "~/db/seed/constants";
 import { ADMIN_ID } from "~/features/admin/admin-constants";
-import { SENDOUQ_LOOKING_PAGE } from "~/utils/urls";
+import { FRIENDS_PAGE, LFG_PAGE, SENDOUQ_LOOKING_PAGE } from "~/utils/urls";
 import {
 	expect,
 	impersonate,
 	navigate,
 	seed,
+	selectUser,
 	submit,
 	test,
+	waitForPOSTResponse,
 } from "./helpers/playwright";
 
 test.describe("User card", () => {
@@ -37,3 +40,54 @@ test.describe("User card", () => {
 		);
 	});
 });
+
+test.describe("User card friend request", () => {
+	test("receiver sees add friend button that accepts the incoming request", async ({
+		page,
+	}) => {
+		await seed(page);
+		await impersonate(page, NZAP_TEST_ID);
+		await navigate({ page, url: FRIENDS_PAGE });
+
+		await selectUser({ page, userName: "Sendou", labelName: "User" });
+		await submit(page);
+		await expect(page.getByRole("button", { name: "Cancel" })).toBeVisible();
+
+		await impersonate(page);
+		await navigate({ page, url: LFG_PAGE });
+
+		await page.getByRole("button", { name: "N-ZAP" }).first().click();
+
+		const acceptButton = page.getByLabel("Accept friend request");
+		await expect(acceptButton).toBeVisible();
+		await expect(page.getByLabel("Friend request pending")).not.toBeVisible();
+
+		await waitForPOSTResponse(page, () => acceptButton.click());
+
+		await expect(page.getByText("Friend request accepted")).toBeAttached();
+		await expect(acceptButton).not.toBeVisible();
+		await expect(page.getByLabel("Send friend request")).not.toBeVisible();
+
+		await navigate({ page, url: FRIENDS_PAGE });
+		await expect(page.getByRole("button", { name: "N-ZAP" })).toBeVisible();
+	});
+
+	test("sender still sees pending state on the receiver's card", async ({
+		page,
+	}) => {
+		await seed(page);
+		await impersonate(page);
+		await navigate({ page, url: FRIENDS_PAGE });
+
+		await selectUser({ page, userName: "N-ZAP", labelName: "User" });
+		await submit(page);
+		await expect(page.getByRole("button", { name: "Cancel" })).toBeVisible();
+
+		await navigate({ page, url: LFG_PAGE });
+		await page.getByRole("button", { name: "N-ZAP" }).first().click();
+
+		await expect(page.getByLabel("Friend request pending")).toBeVisible();
+		await expect(page.getByLabel("Friend request pending")).toBeDisabled();
+		await expect(page.getByLabel("Accept friend request")).not.toBeVisible();
+	});
+});