Once she had released his cock, he felt her fingers on the back of his thighs again. She moved them higher, tracing the crease beneath his buttocks. She cupped his ass while her hair and nose tickled his sack and cock. His hips thrust, looking for something, anything to fuck. She smacked his ass with one hand, continuing to kiss between his legs, beneath and behind his balls.
He tried to hold still and was rewarded by her finger circling his ass. He had no idea how sensitive he was there, how good that simple touch could feel. She wasn't pressing, wasn't even hinting at inserting that finger, just circling. He groaned and gritted his teeth.