Bored and curious, I join my stepbrother and his GF in his room. She's on her knees, eagerly sucking his cock. I can't help but notice her expert technique, her full lips wrapping around his shaft. She takes him deep, gagging slightly, but never losing rhythm. I harden watching, and she notices, inviting me to join. I unzip, and she alternates between us, her spit-slick hands stroking us in sync. She moans, vibrating our cocks, driving us crazy. We fuck her mouth together, our hips thrusting in unison, until we can't hold back. We come hard, filling her mouth, and she swallows every drop, licking her lips with a satisfied smile.