Sex with MC in a Seo manga is reserved to the winning girl.
The Hedgehogs guitarist asks Fuuka if she's distracted thinking about going home to have sex with Yuu, and she admits it's true. Then she goes home and practically begs Yuu to have sex with her, and he says he's too busy thinking about his bass lessons. Note that she practically begged Yuu to fuck her in the last chapter too, and he didn't do anything at all until she jumped on top of him. He didn't have an excuse at that point either, he was just eating lunch.
Dude doesn't need bass lessons, he needs lesson in how to not be a huge fucking wuss.
Can't have any sex in this manga until after the anmesia Fuuka arc.