I actually can't think of many games where female MC doesn't turn into the town bicycle with no complaints from anyone. But okay, let's limit it to games with a smaller scope where the males all know about each other
and the corruption is more sex-positive.
https://thef95zone.info/threads/the-princess-of-zeven-v1-02-lovely-pretty-ultra-loving-you.23791/ I can't recall how the corruption starts, but I think the endpoint is basically what you describe.
https://thef95zone.info/threads/succum-brewery-v0-3-8b-limejuicegames.134566/ This is a great example. Mostly consensual corruption with a bit of hypno, and the sex ends up very... communal, i.e. free-use. But if you want to see the males and not just caricature shadows, you'll be disppointed.
https://thef95zone.info/threads/third-crisis-v1-1-0-anduo-games.9027/ The setting is already a fuckfest at the game's start, and MC can partake or reject it. Mixture of dubcon, con and hypno depending on your choices.
https://thef95zone.info/threads/simply-mindy-v3-6-0-sexums.1817/ MC basically begrudgingly drifts into becoming a prostitute at every job she attempts. Not much if any communal aspect though, partners are separate.
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You'll need to mod Fallout 4 for this, and it has some unavoidable rough stuff happening to MC. But I've never seen a MC passed around so liberally, she's a full-on prostitute and porn actress (Nora route). You can roleplay a more or less willing MC if you want, or someone with doubts and resistance.
https://thef95zone.info/threads/barely-working-v8-0-0-dpmaker.132651/ Perfect example of what you describe, MC is everyone's free-use secretary.
