There's something very important to factor here, Tomomi and Akiharu are slowly getting away their chilhood and will become adults.
They are at a time when views change and Akiharu can't forever hold a grudge or be afraid of Tomomi.
He's portrayed as slightly uninterested in women for the moment (but gets body reactions), but that will change too.
From there, everything can change.

Regarding Selnia, it is strange to think that in a way Akiharu treats her a little like Tomoni does treat him. You would think that he likes her enough for her to be his favourite partner. Same could be for Tomomi, that's what she tried to find out this episode at least.