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Fenris has never had a willing sexual encounter with a man, and has some assumptions about how it must always be unwilling between two men. Somehow, he stumbles upon Anders revealing stress by a quick go with a guy, and Fenris assumes Anders is being raped. Even if he doesn't like him, Fenris doesn't stand for that and interrupts, making Anders mad because it scares off the guy he was with.
Fenris is mad because he thinks he did Anders a favor and Anders is too stubborn to admit it.
Eventually Anders ends up proving to him that he really does enjoy getting fucked by guys, by getting Fenris to fuck him.