Finish H(er)im

You grip his cock tightly, rapidly stroking him in tandem with your own thrusts. The teen boy's anal walls gripping your cock, clenching it with his pleasure spasms. You right hand busy stroking his cock while your left slowly rubbing up his body until it finds his mouth. Two fingers inserted into his mouth as he sucks the sweat off of them, his moans vibrating your fingers. You howl in pleasure as you start to cum. Your fluid filling his ass as he cums too, writhing underneath your weight. Rapidly the transformation takes the teen boy's body by storm, his chest swelling to size DD, his butt thickening, and her new dick swelling from it's original size of 12 inches to 15 inches, surprisingly huge for an infected that wasn't a Lancer. A howling moan escapes her lips as a new sister is born into the horde.