I had no idea my girlfriend was a lesbian, let alone that she'd be fucking my step-sister when I left them alone. Walking in on them was like stepping into a porn set - Eastsidebabe's curves jiggling as she rode Akin's massive cock, her face buried in Hot Schne's pussy. I stood there, hard as a rock, watching my step-sister's round ass bounce as she took Akin's BBC doggystyle. The sight of my girlfriend's big booty slapping against Akin's hips as she titty-fucked him, her juices dripping down his shaft, was too much. I joined in, my cock slapping against Eastsidebabe's face as she switched between sucking me and Akin, her eyes filled with lust and hunger.