Watch Stepbrothers with Benefits for Free: How to Stream the Movie Online at 123Movies. . Dallas Preston has a thing for his stepbrother Shane Cook, so much so that he has to sneak into Shane's room just to jerk off. But, when Shane finds Dallas, things take a wild turn. Carter Woods is feeling super horny after a girl he was supposed to with bails on him. But, when his stepbrother Harley Xavier suggests the two fuck, Carter has his doubts. Only gay guys fuck other guys, right? Or does Harley know something Carter doesn't in Stepbrothers with Benefits? Dallas Preston is moving in with his new stepbrother, Jayden Marcos, and the rest of his new family. However, when Jayden gives him a little too warm of a welcome, things take a wild turn for the stepbrothers. Ben Masters loves fucking Brandon Anderson's big hard cock.