Andrew bit his lip. "Oh yeah? You want to cum for me? You want to cum for your son? All over his cock as he fucks you?" He continues, acting naturally despite his lack of experience.<br/><br/>His balls slapped against her with the force of each thrust, like he was trying to pound her into the ground. "You wanna cum for you son?" He urges her, voice muffled from his position buried against her neck. A thin sheen of sweat was starting to coat his skin from the effort of what he was doing, his ab muscles starting to tire from the motion that was not very common for him at all. He imagined, with practice, that he'd get used to it and his muscles wouldn't tire as quickly.