The Cuckolder —
A Universe from the Mind of JoeTortuga
He's the Cuckolder, a man who only has sex with people in committed relationships. He's dominant, clear about what he wants, and has cuckolded many. These are his stories: what he does, and how he came to be the way he is.
Brian Erhard doesn't believe in relationships for himself, he's the one who breaks them. Still, he only has sex with people in a committed relationship. When he meets the submissive Madeline in a bar, it seems like things might change. This story does have some MM sex, but always from the Brian's dominant point of view.
At fifteen, Brian's family moved to Cleveland. He's trying to save enough money from his lawn care business to buy a car. His (young, married, sexy) next door neighbor offers to pay him with other currency. This is the first of planned trilogy detailing Brian's origin as The Cuckolder. This is a BDSM-light story, but there are scenes which occur later, near the end.