Mid-DnD session, Shake the Snake's step-sis can't keep her eyes off her stepbro's growing bulge. She 'accidentally' spills her dice, bending over to pick them up, her short skirt hiking up, revealing her lacy thong. He's supposed to be the DM, but she's the one calling the shots now. She turns around, tits heaving, and climbs onto his lap, riding him reverse-cowgirl, her big ass bouncing, as she tits-fucks him, their DnD books and dice scattered around them, forgotten in their intense, roleplaying-fueled fuck fest.