Yareru Monnara Haramasete Miyagare

Toba and Banzawa are a pair of delinquents who are totally out of place at the prestigious alpha-only school they attend. Together they take on delinquents from other schools, and Toba is the only one Banzawa trusts to have his back in a fight. But Toba is keeping a huge secret from his friend: He's actually an omega, and he knows he'll have to leave school once his first heat comes. But he doesn't expect to go into heat right in front of Banzawa, or the unbridled passion that results when Toba's pheromones enflame Banzawa's desire...