You pull it out, and jerk off right in front of her.

John stands there stammering at her sudden command, but the whole scene is just too erotic. He pulls down his pants, surprising both of them as his 8 inch hard cock springs out freely. Slowly, he wraps he hand around the shaft, feeling how truly it's grown bigger since he last jerked off. His hand starts to stroke up and down its length, the pleasure feeling incredible.

Anna watches carefully, biting her lip as his hand travels the length of his cock, her own slowly gliding over her new fat curves. The view is erotic, the thoughts of this being like a bizarre scene in some porno races through John's mind. His gaze follows her fingers as they travel over the top of her plump chest, the shirt covering her tits barely holding on and certainly has no hope of covering her soft and round belly. A fact she emphasizes as she traces around the top, down one side and changing course to the front side. When she reaches her belly button, her middle finger pokes inside… then sinks further into it. A naughty, lust filled grin crosses her lips as she fingers it, her eyes locks with John, making it impossible to miss his gaze fixated on her navel.

“Mmm, it’s almost deep enough to fuck, don’t you think..” her words tease, thick with sexual temptation and invitation.

John resists the temptation to step forward and try to push his cock against her belly button. They both know he wouldn’t be able to actually fuck it, not at her current size, but the thought is undeniably arousing. His breathing gets heavier at her words, his strokes getting faster as his pleasure and arousal climb higher. She doesn’t miss it either, continuing to move her finger in and out of her navel as her other hand grips the underside of her belly fat.

“Oh fuck, John. Fuck my belly button. Stroke that dick faster, baby, make me so much fatter so your huge cock can fuck this big fat belly,” she moans sensually, “Bust me out of these clothes they’re just soooo tight. I need to be bigger, and fatter. Mmm, yes, stroke for me, make me grow.”

John's breathing gets heavier as he keep stroking, his brow furrowing as he can feel his orgasm building up with each stroke. It’s getting to the point where he feels like he's about to burst. He just needs one more push…

Anna caught on, too, apparently, a naughty smile crossing her lips. “Hmm, and then next you can cum inside me.”

There it is, the very push he needed, his hand continuing to pump up and down his cock as the climax washes over him. Cum shoots out as he loudly moans, unable to help himself due to the sheer pleasure from the orgasm. A few globs landing on Anna and her clothes as she begins to expand right before him.

“Oh fuck, John! Yes, yes, make me fatter!” she moans, eyes closed as her hands grip her side rolls. John's eyes lock onto her plump body as she grows fatter before his very eyes. Her belly, thighs and ass quickly rip her shorts apart as they expand fuller, wider, bigger. Her belly jiggles softly as it settles lower against her legs. Ripping and shredding continues as her tits expand larger, her arms and shoulders padding up with enough fat to destroy the sleeves, followed shortly by the sides of the shirt and it falls away. She's not wearing a bra it turns out, her breasts now fully exposed with her erect nipples standing to attention.

Her fattening expansion soon ends as John's orgasm does, leaving her panties as the only survivor despite the rips and tears, and a mess of cum on the floor around her. Anna sits on the couch as he catches his breath, looking down at herself a little disappointed.

“Damn, I was really hoping that…” her thumb hooking under the waistband, she pulls ever so slightly on it before it SNAPS and slips off he thumb to fall to the floor. With a smile, Anna looks at John, then his still hard as ever cock.

“Mmm, this was nice. Now, looks like it’s my turn to return the favor…” Anna bites her lip, a sly grin on her face.