You walk in and see your girlfriend blowing her step-brother! She explains to you that she just can't get enough of his big cock! Even though you two moved in together shes been fucking him for way longer. It's not like she can just stop; she's addicted to his huge cock. Telling you to stay and watch while stroking your little penis she notices you get harder hearing that. This is your new dynamic now. You'll forever be cucked by your girlfriends own step-bro. But it's okay because she's going to let you cum inside her once hes finished on her juicy ass. You're going to love it!