Responses

Yes, pretty sure he was. Although not explicitly shown, it was hinted he was. I remember there was also a chapter where they mentioned his addiction to sex happened after escaping formicarium (don't remember the ch tho). So, his addiction to it is most likely a trauma response wherein he wants to feel superior/ in control whenever it happens, thus, he is dominant in bed.
Also, don't worry. You are not fetishizing for simply being confused. It's okay to ask questions.
Y'all I'm not fetishizing or anything I just wanna understand to which extent peter went to...
Did Victor get SA'd in the basement with Peter?
There's no explicit warning for any of the flashback chapters but everything feels really vague and it barely even shows him getting beat up, I just can't wrap my head around what actually happened in the basement. At some point just beating him up has to get boring for Peter right? But we don't see him using any other kinds of physical torture like ripping out nails, waterboarding, whatever. Wtf was Peter doing the whole time in the basement with Victor?