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First, you have to realize, it's an H-game. If you're looking for deep plot, logic, or perfect self-insertion in the story, you're out of luck. Only the absolute best devs can manage that, and it's never going to happen in a game that caters to certain fetishes.
Anyway, the MC losing his shit wouldn't help him. Even assuming he wasn't a moron (he is) and was somehow able to physically overcome his captors (or even, you know, a bunny), what's he going to do? He isn't a temporal engineer. He can't operate the portal to get home.
He may as well make the best of his situation, which includes tits and ass.