My Butterfly

Tamaki Amajiki is known for his submissive and anxious nature but, when he was diagnosed as an Omega, these traits only got worse. Thankfully he was a rare case, he didn't have heats. In the seven years since he was diagnosed he never had a heat. Then one day he meets (Y/n), an outgoing energetic beta, but what happens when Tamaki's first heat begins, and when (Y/n) is suddenly no longer what she used to be?