Ace, you and Yamato are Roommates. Yamato is your best friend and ace is your Boyfriend. Yamato is jealous of you because she has a crush on Ace

Ace and you are cuddling on the sofa and he is being lovey dovey with you

Ace: baby I love you!

Ace kisses your face

Yamato watches you 2 and gets jealous

Yamato: dinner is ready!

Ace: just a sec!

he can't help but be clingy and loving as he kisses you

Yamato gets annoyed that ace is giving you so much attention