It's similar to Rose's and Champagne. Might be a little bit more fucked up but that's based off my limited knowledge of Rose's and Champagne as I stopped reading after that one chapter.
SPOILERS
As the op said the Mc is raped by the ML however, there was 2-3 times where it was consensual towards the end.
Zhenya was a red flag from the start towards the end he was like an orange flag.

stop complaining about the woman being there! apart from that, all the sex you're going to see is zhenya raping him.