Omega Megaera 2

Saimon's big plan is off to a perilous start when Mamiya goes into his first heat right after he's introduced to the Hanabusa family. And just when Saimon thinks they're in the clear, the Hanabusa family butler, Shiba, reveals that he knows of Mamiya's true nature—and he wants in on their plot. With Shiba's help, Saimon manipulates his way back into his sister's pharmaceutical company to make illegal heat suppressants for Mamiya. But will the pills be enough for Mamiya to survive in an elite high school full of alphas? And what's Shiba getting out of this arrangement…?

Volume 2 of the Omega Megaera manga series by Maki Marukido.