I'm so sorry to say this Nana-chan but boing-kun here has the bottom aura.

I think the story is showing he’s straight cuz uh the whole boob loving thing lol- so he can’t be a bottom cuz that means he likes to be pegged (which isn’t being eluded to) or he receives the d1ck in the ass. He could be a sub cuz dom and sub can be used for gay relationships and straight relationships. Little rant but yeah I think a lot of people confuse dom and sub with bottom and top.

I know. issa joke tho when sexy male charas pose like dat. Not sure about everyone but most of em are just joking about him getting it on with ass