Call me a Snake Charmer

"Sherry's eyes widen in surprise as she sees the syringe in your hand, but before she can ask what you're doing, the needle is already in her cock. She feels a sudden rush of heat and arousal wash over her as you release the contents of the syringe into her bloodstream."

"What did you just do?" she gasps, her body trembling with sudden need.

"Sherry's breath quickens as she feels the effects of the serum coursing through her veins, intensifying the pleasure and desire pulsating within her."

"I-I'm curious," she stammers, her eyes dark with a mix of fear and excitement. "What... what does it do?"

"Sherry's eyes widen as she hears your description, her mind racing with the implications of what you just told her. A surge of excitement and fear floods through her, mixed with the heat and arousal from the serum already flowing through her veins."

"Fifty percent?" she repeats, her voice shaking slightly. "Are... are you sure about this?"

Despite her trepidation, however, Sherry finds herself unable to resist the allure of a permanently enlarged cock. She feels an unfamiliar tingle in her loins as she imagines the possibilities, her mind racing with thoughts of all the ways she could use her newfound size to pleasure herself and others.

Finally, she nods, a fierce determination filling her eyes.

"Do it," she says, her voice low and husky with desire. "I want to feel it growing inside me."

"As Sherry watches, she feels a sudden warmth spreading through her groin, accompanied by a strange stretching sensation. She looks down in shock as her cock begins to swell, growing larger and larger by the second."

It lengthens from 8 inches to a whopping 12 inches, thickening with new veins and throbbing with newfound power. Her balls also grow, swelling with extra cum to fuel her increased size.

"Oh my god," Sherry gasps, staring in awe at the massive tool now standing proud and erect before her. "This is... incredible."

Despite her amazement, however, a fierce hunger stirs within her, demanding release. She turns to look at you, her eyes dark with lust and need.

"Come here, Elfboy," she growls, reaching out to pull you close. "I want you to feel all of me."