Jess’s turn to grow bigger breasts

Jack couldn’t believe it, Jess couldn’t deep throat this cock size, now she wants to ride it.

Jack watched as his cock head slipped inside his sisters vagina.

“Ms Jess, how do you think your going to take it all inside you, especially that size, even my older sister’s biggest dildo could not compare” the nurse said worried.

Jess just smirked at Jack, “good thing I practiced with my monster dildo I had secretly bought with my babysitting money” laughed Jess as she took more of his cock inside her.

‘Wow, she is really taking it, wait, when I enhanced there desire, did it also enhance her...wait, monster dildo’ thought Jack watching his sister only take almost half his length, as she took as Much as she could, Jack could feel the tip of his cock had pushed against her womb, when she took as much as she could, she started bouncing, her face blushing red.

‘Wow, she is really impaling herself on my cock’ Jack thought as he watched her bounce.

“Oh fuck bro, your cock, this is the best fuck I ever had, I haven’t even found a boyfriend yet, agh” Jess said moaning, Jack looked up from where he was staring at his sisters vagina, watching her breasts bounce.

‘You know, I made the nurse’s breasts bigger just by thinking it, so maybe I could do it again, this time for my sis’ thought Jack.

Watching his sister bounce, resting against two big warm pillow breasts, he thought.

‘Jess may have the smallest breasts in the family, or at school, but as her vaginal simulation grows, so do her breasts, and when someone cum inside her, her breasts will grow faster, also when she orgasm would cause her breasts to grow faster, they will return to normal once she rests’

“ oh fuck...ah...so good” Jess said smiling.

“Mis Jess, please remember your condition, you remember the last time you where here” cautioned the nurse.

Flashback

the nurse entered a wing of the hospital used for breast cancer patients, laying on the bed was a female teen, she had turned 18 a few days ago, she was nude from the waist up, her breasts where the size of beach balls (rank b level 3), the teens mother was sitting in the chair, holding the girls hand, after some tests, she told the mother that the teen had a condition called the B,E,E (breast expansion excitement). It cases her breasts to expand when she simulated her vagina, after a few min, her breasts started to shrink.

End flashback

“But his dick is so good” said Jess as she pinched her own breasts as they started to grow.

‘Shit, it’s happening, they are growing’ thought Jack as they went from (rank a, level 4) to (rank b, level 3) in size.

“Sis, your breasts, there big” smiled Jack.

“oh, it’s...ah...umm,.my condition, when my vag gets simulated, it...ah..makes my tits bigger“ confessed Jess, her breasts where now big and round, just a little bit bigger than the nurse, he couldn’t believe what was going on, first with the nurse, now his adoptive sister was riding his cock, her boobs where huge.

‘When I cum, it will be 3 times as more than before’ thought Jack, then smiled as he felt his balls throbbed.

Jess stood up once more, his cock slid almost the way out, when she impaled her self once more, he started to cum, shot after shot of cum filled her up, it was so much, it spurted out around his cock.

“There he blows and she grows” giggled the nurse, as Jess’s breasts expand again, going from (rank b, level 3) to ( rank b, level 5)

cum was still firing out of his cock, after a few more shots entered Jess, when his cock finally slipped out, his lap was covered in cum, his sisters breasts where heavy, making it hard for Jack to breathe, so after pushing the giant breasts to one side, he slipped off the bed, from his chest down, he was covered in cum and pussy juice.

“Shit, that was great an all, but I am filthy, and hungry, I am going to shower and get something to eat” said Jack grabbing his gown, putting it on it hid his enlarged cock, he left the room to seek a shower.