could’ve been reversible couple, too bad

Fumi did mention he said he’d only top because he was scared Shunpei would reject him as a man, meaning he was scared Shunpei wouldn’t be able to penetrate him if the time ever come. So, from the get go, Fumi was fine if Shunpei insisted to never bottom, as long as he loved Fumi. As their relationship stabilizes, Fumi becomes more comfortable with the idea of being held by Shunpei, so he offers to bottom a few times. I think Fumi wants to bottom. Because he genuinely doesn’t characterize a gay relationship by roles. However, I think letting Shunpei taste the pleasure of anal for too long worked against Fumi. Should’ve let the guy top earlier in the relationship lol