Jack off on top of her, by hand

Luna admires her handiwork for a moment, congratulating herself on her new furniture. Not only is Hermione unrecognizable to others, seeing her in this form is a real turn on! Luna notices her new cock rising, as if raising a tentative hand to answer a question. Luna laughs and grips it firmly, her swift strokes quickly erecting it to full mast.

She turns, and leaps backward onto the bed, sinking a few inches in it’s blubbery surface and feeling the embrace of it’s folds around her nude backside. She quickens her fapping, knowing that Hermione is at least somewhat aware of the pleasure going on on her belly, and yet unable to participate or disapprove.

The sound of Luna’s hand slapping against her crotch grows sharper as her dick becomes moist from sweat and precum. Luna’s clean-shaven pubic area glistens, and the products of her fun seep onto Hermione, staining her surface with sexy juice. Luna tucks her other hand under her thigh, and plunges her fingers into her wet slit. With that leg bent to allow for her fingering, she rocks violently back and forth, bouncing up and down on the Hermione Waterbed as she moans loudly, her mouth fixed open and her eyes glued to the inside of her temple.

Hermione feels every motion throughout her inflated body, the bouncing echoes inside her, and the stench of sex makes her want to cum. She has so much within her, and she just wants to pop and let it all flood out, leaving her deflated like a burst balloon, but every hole is sealed and blended into her skin, so she can do nothing to release the pressure.

Luna, on the other hand, is full of holes. Her balls quiver and shrink, squeezing their cum up into her cunt and back out through her dick. She arches her back and stuffs her fingers deeper into her pussy as she erupts, showering herself and the bed in cum. “UuuuaaaAAAAaaauuhhhh-ugh…” Luna howls in triumph, before collapsing onto Hermione’s wobbly body in her puddle of jizz, exhausted.