As much Gwen liked Ben grabbing her huge ass, and she had liked the kissing part too. But nothing compared to the squriming that Ben did when she was sitting on him. She had experinced her very first orgasm while sitting on her cousin, and she wanted to have another one. Gwen looked at Ben's enlarged member and wondered why it looked bigger than normal...maybe a side-effect of the spell? She didn't really care.
Gwen had gotten off of Ben. Ben looked disappointed at first.
"What are you doing?" asked Ben.
"This!" said Gwen, and she turned around and sat back down on Ben. Ben only smiled and started to feel around Gwen's massive ass. His rigid member had found itself right in Gwen's buttcrack, and it was still throbbing. Ben started to hump his own cousin's ass, not fully understanding why he was doing it...he was acting on insnict. Gwen moaned as she felt Ben sqiurm under her massive ass once again...it felt so great sitting on someone and have them squirm under you. Maybe Gwen would sit on the next alien that came for the Omnitrix and crush 'em with her beanbag-chair sized butt. Gwen also moved her ass from side to side, enjoying the feeling. Oh yes...she could get use to sitting on people.