Brothers and Boyfriends

S5 E7: A gas leak at the Gallaghers' brings sexy fireman Sean to Ian and Mandy's attention. The two soon get competitive as to who'll get to sleep with him and a wager is made. Ian wins, and gets more than he bargained for: a relationship. It's not long before Ian's introducing him to the family but, just as everything's looking rosy, he discovers a secret about Sean's past that has explosive consequences.