Can help find a yaoi manga?

It's about a buff guy who trains masochists to be auctioned off to people. But the buff guy is jealous and wants to be domed also. When he was actioning off someone, he caught the eye of someone using binoculars, this person thought of the buff guy as a big dog and wants to buy him.
That's all I remember, please help me find it. ┗( T﹏T )┛