Heat x Beat: I May Be an Omega, but I'm Going to Be an Idol! by Ken Homerun

Asahi wants nothing more than to be an idol, and when he's chosen as the latest member of boyband B-Marks he's over the moon. Except for one little detail; Asahi is an omega, and one of the other members, Madoka, is an alpha. Insisting on staying unmated to remain loyal to their fanbase, Asahi agrees to a "friends with benefits" arrangement to appease their hormonal urges without commitment. At least, that's what he intends...
Binding: Paperback / softback