Omega Marking

Tatsuru is an omega, but pretends to be a beta at school. He dreams of finding a beta wife to marry and living happily ever after, but things don't quite go according to his plan. One day, he drops his suppressants while at school. As he's panicking, and looking for them, alpha Yuta, who picked them up earlier, arrives to return them. But, while the two of them are alone Tatsuru goes into heat...!!!

(Source: Renta!)