To give Aaron a little 'head'

"What do you think" Natalie said with a giggle. "Don't forget, I'm still thinking with my pussy."

With that, Natalie pushed Aaron onto his back, straddling his waist with her mouth open just above the head of his cock. Her tongue darted out, licking the tip and Aaron briefly wondered whether this counted as sex or a blowjob.

"She's begging me to stop," Natalie said with an evil grin. "As if she hasn't made me do the same thing before."

Aaron felt soft lips close around his penis, the warmth of his sister's mouth sucking gently as it descended. He expected a gag reflex as he sank deeper into her... throat? Natalie seemed to be curious as well, grinding her hips when she had Aaron's entire length buried inside her. They shrugged at each other. Wizards.

She raised herself up and dropped against him, throat-fucking herself against his cock. Her... jaw? (man this was weird) was held wide open so that her teeth didn't hurt him, and she made strange gargling noises as she plunged him in and out of her mouth.

The sight of his sister bouncing up and down on his crotch, pussy-face leaking juice and tits jiggling up and down while he felt his cock being sucked became too much.

"Natalie!" he groaned, using the name for the first time with his new 'sister'.

A muffled moan between his legs and an expression of bliss told him that she liked her new identity - loved being Natalie - and the vibration of her voice sent him over the edge, her mouth milking him dry and he shot his load into her.

She stayed upright above him, her fingers idly stroking her pussy lips as he lay gasping beneath her, and finally lay down beside him, wrapping her arms around his shoulders. His dick came free from her mouth with a slurp and he could hear her panting below him as well.

"That was incredible," he said, still trying to come to terms with everything that had happened.

Natalie nuzzled her face against his neck, some of her juices rubbing off on him.

"You okay, Nat?" he asked, noticing how her pussy twitched when he used his sister's name.

Natalie looked up at him with a pleading expression.

"Kiss me?"