His song literally says "I want to violate and be violated" he is good with doing both, he is a bottom sometimes but he also wanted to top itzkaidou
I know what he says but the whole "top/bottom with a 7/3 rate" seems like he's afraid of enjoying bottoming and losing his "masculinity" because otherwise why would you put a cap on how many times you can bottom in a month???
Tamura is meant to be a bottom he just doesn't want to accept it. He practically glows when he's being fucked