Bill really had other things on his mind than dancing, but he'd get to those sooner or later. For now he was going to dance because the girls had earned it. He wasn't the best dancer, but he knew how to move to the music. Pressing himself against Lavender's back and her tight ass, Bill learned down and kissed her neck. "What do I get if I dance with you? Doesn't seem like you two need me for fun," he teased. The three of them were pressed so close together that Bill could reach for Parvati's hip and draw her even closer until Lavender was snug between them. His held Parvati's hip, very tempted to slip under her skirt as well. But, no, better to make sure he wasn't going to risk his chance of getting laid that night.
And that train of thought lasted for about three seconds before Bill slipped his hand under Parvati's skirt while grinding himself against Lavender. His fingers brushed over Lavender's as he helped her tease her friend.