Expanding Sarah

Sarah felt a strange tingling sensation in her chest, centred mainly on her boobs but that sensation was easily overshadowed by the feeling of getting her pussy filled up with a seeming firehose of hot, white cum. It was like almost every muscle in her lower body was spasming with pleasure as Adam came bucketloads of sperm into his sister with every powerful spurt.

Sarah was lost in pleasure, her arms limp by her side, her tongue lolled in her mouth, feeling her womb being hosed down by her big brother. She suddenly felt the tingling in her breasts return with ****.

She tried to lift her head to look down on her body. It was really hard do so as her own constant mind-blowing orgasm, coupled with Adam's ragged thrusts as he still kept cumming into her, **** her to throw her head back and howl in bliss.

Adam was moaning and groaning loudly, his eyes closed, as he felt his balls pumping like pistons to release more of his hot, virile sperm with **** ****.

"FUCK YEAH! SARAH, TAKE IT ALL!" he shouted.

Adam started slowly rocking his hips back and forth, slowly gaining speed until he was fucking his sister forcefully, filling the room and probably the whole house with lewd slapping sounds, heightening his pleasure by a thousand-fold as he felt her cunt spasming and clenching around his cock while he came, it was truly a heavenly feeling. When Adam opened his eyes, he saw something that he was almost sure he would see, the side effect of his cum(he was sure of it), Sarah's boobs were growing just like Emily's back at the store!

Sarah felt the weight on her chest increasing ever so slightly, even though her belly weighed much, much more heavily due to the crazy amounts of cum inside her while Adam still fucked her during his orgasm, his sperm flying around his cock forcefully and staining the bedsheets. She barely composed herself enough to look upon her body, and saw that her boobs were bigger now and still growing, from her previous C-cups, they were now at least double D's and still kept growing with almost every breath she took. Just through the cleavage of her boobs, she could see that her belly was greatly swollen with Adam's load which finally seemed to be slowing down a little, above it she could see the gasping and groaning form of her brother, beads of sweat running down his angular, handsome face and his muscular chest and abdomen.

'He is beautiful.' Sarah thought. She saw him look directly in her eyes and he gave a warm smile while he still fucking her with his colossal flagpole of a cock, making her heart almost skip a beat through all this pleasure.

Sarah's boobs also kept growing and growing, now almost as big as her own head, probably bigger, a whopping G-cup at least. Sarah finally felt the flow of cum within her slow down to a trickle, even though her whole stomach sloshed audibly with the insane amount of sperm inside her making her look like she was full term pregnant with triplets. Her orgasm finally stopping as well. She looked around, pearly white cum was all around her, on the bed, on the floor everywhere, it's intoxicating smell filled the room and possibly the whole house as well. Adam sat there, with his still fully erect cock lodged inside Sarah's pussy, plugging her hole from expelling the massive cumload, even though some still leaked around it.

He slowly strokes her belly, and then launches himself on her new boobs, sucking and squeezing them hard. Sarah gasped loudly as her now super sensitive breasts were handled roughly by her brother. The sensation brought her to another orgasm, eliciting a groan from dam as he felt his cock being milked by her cunt again.

The two lovebirds failed to notice that they had some audience at the door during their fun, lured there due to their delighted noises and the intoxicating scent of Adam's cum.