Could I please request the GOM, Kasamatsu, Hanamiya, and Takao reacting to their s/o telling them that they're asexual?
Kuroko: He didn’t really see sex as the biggest part of a great relationship anyway, so it doesn’t affect his feelings for you in the slightest. He’s glad you trust him enough to be truthful about this part of you.
Kise: It would be lying if he said he understood. He had been eager to one day get intimate with you, but knowing this about you dashes those fantasies. Still, he continues loving you and wants to reevaluate his personal relationship goals.
Kasamatsu: There’s a moment where he starts doubting himself, thinking it wasn’t sex you didn’t like, but him. It only lasts a moment though; he’s logical and knows you’d tell him if there were anything wrong.
Aomine: Sex had been something he’d seen in his relationship, so you being asexual definitely threw a wrench in that. He didn’t love you any less, but he needed a little time to understand and come to terms with it.
Midorima: The first thing that comes to mind is the literal definition of the word he knows from biology, but he quickly understands you mean differently. He appreciates that you’d tell him something that might be difficult to confess.
Takao: He doesn’t exactly understand how somebody could find it hard seeing the appeal in something like sex, but he doesn’t push the subject with you any further. It was your body after all; you decided what to do with it.
Murasakibara: If you don’t explain to him exactly what being asexual entails, the only response you’re going to get from him is a less than understanding, ‘ah’. He doesn’t mind that you’re not into sex.
Akashi: Sure that this was something you didn’t go around telling everyone, he’s grateful that you felt comfortable enough with him to reveal it. He would never want to make you feel uncomfortable in the relationship.
Hanamiya: It was supposed to come out as a joke when he asked in return if you’d still be willing to do things for him, but he regrets it the moment you make a pained face. He’s not too sensitive with the subject, but he’d try to be for you.