Wagamama mo Kimi no Tame Nara Ikura Demo
Uke is an omega and sleeps around, he doesn't take anything serious, until he finds a serious guy in his class that cach his attention so he starts to " tease him", after many interactions the seme falls in love with uke, so they become sex friends, uke stops sleeping around and when they graduate middle school uke notice the seme is getting more attention (for being an alpha), uke gets jealous and learns about his feelings for seme
The Alpha's Bride
Omega (who thinks he's an alpha) belongs to a prestigious alpha family, when he turns 17 he attends to a party to make his debut to high society, that party is held by the most important alpha around who's looking for hid fated pair. At the party omega gets his first heat and is save by alpha
2ban-me no Alpha