"Oh my god, it's so... hard!" An excited Alicia giggled, staring down at the protrusion in her skirt. She couldn't help but give it a rub through the fabric when she was sure nobody was looking in her direction apart from her brother. But David was too preoccupied with his own anatomical change to stare at his sister for too long.
"Yeah, its called an erection for a reason sis." David did however reply to his sister's comment, looking up and winking at her. He could tell from her reactions that she was suddenly incredibly aroused, which was understandable since it wasn't every day a girl grew a dick, swapping her vagina for her brother's penis. Alicia's cheeks reddened as she became flustered, as she blood rushed into her already engorged member.
As he continued rubbing his sister's pussy through his pants, David was pretty turned on himself. And getting 'wet' was a whole different experience from getting a stiffy between his legs. He tried distracting himself a little by making a couple more swaps, but all it did was turn him on more, especially when he deflated the D-cup breasts of a blonde girl and transferred them onto a nerdy male student nearby.... nearly ripping his t-shirt down the sides.
The other swap was equally hot to David, as he watched two dating students with their backs to him. The girlfriend's heart-shaped ass shrank in her skirt, taking on manly proportions, while her boyfriend underwent the opposite change as his girlfriend's former ass filled and stretched his jeans.
"Oh god!" David moaned, happening to catch Alicia's attention.
"Maybe we should go somewhere more private before we orgasm in public." She suggested with a chuckle.
"Good idea." David smirked, deciding to take his sister back to the room he shared with James.
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