Jealous Ayato Sakamaki x Reader
Ayato acts like his normal self, the "I am the number one" and "Nobody is better than me". Ayato likes you but does not know how to express his feelings towards you, so in result he acts like a total ass. You get tired of his attitude towards you, no matter how much you liked him you also loathed how he acted like a jerk to you. So in conclusion you ignored him the whole day and just talked with Subaru while he got jealous and ultimately showed his soft side to you.
Actually read the story if you'd like to know what happens next.