Chuuya is currently staring coldly at the woman Dazai's flirting with. Does he not understand he's his? Does he not get how much Chuuya adores him? How precious he is for Chuuya?

Well. Chuuya won't retain himself from teaching Dazai a lesson. Even if he hurt him, even if Dazai asks him to let him alone, it won't happen. Because Chuuya loves him dearly, and he has enough love for both of them. Because that's what true love is about.