The seme fell in love with the uke when they did it i think and after that he felt guilty about what he did to the uke and decided to confess his feelings but he got rejected then the uke came to him cause he needs him sexually from there... The sem is trying to treat the uke tenderly ε=ε=(ノ≧∇≦)ノ
Takamada(seme) are a virgin and has kinda sexual trauma. So when they accidentally had sex he explored sexual desire and after talk about his past he's starting feel guilty and kinda fall in love to Koyama(uke). And Koyama's starting to feel sympathy cause seme told him about himself and he's kinda understanding Takamada's behavior.
Can someone explain to me why did they like change personalities???? Im not really reading thw while story just part of it so im really confused