Isaac hasn't locked the door and Emma let's herself in.

(This chapter originally by "IndianaJones393")

Isaac sat on that small chair, his eyes closed. Isaac's brain was completely fogged. He couldn't bare to move, he couldn't see straight, and he could barely think. All the energy he'd stockpiled over the day, all that mojo from all those meals had pushed him to the limit. That little touch had sent him over the edge, and now he was trapped in this small room leaking precum in an ever growing puddle on the floor. His dick begged for attention, his insides seeming to scream in his brain as they begged to used. He had never in his life been so consumed with the need to cum, the need to breed. So scrambled were his senses that he never heard the door open.

Isaac suddenly felt soft hands start rubbing on his shaft and his eyes snapped open. Even in his semi-delirious state he recognized the form of Emma kneeling on the floor in front of him. Her eyes seemed hypnotized by his massive manhood. She had wrapped both hands around his cock, barely able to touch her fingertips it was so big. She pumped up and down slowly, gently moving along its massive length. Isaac let out another groan. It felt amazing! But he couldn't let her...

"Stop...." he whispered weakly, his voice hoarse. "I...I can't..."

Emma didn't stop for a second. Her hands kept working as made eye contact with Isaac for the first time since she'd laid eyes on the monster between his legs. She smiled warmly, raising a finger to her lips.

"Shhhhhhhh. Don't say anything, just relax." One of her hands went southward, slowly massaging the basketballs between Isaac's legs. Isaac let out another groaned. "You're just so pent up! Don't fight this, let me help you."

At that point any will to fight Isaac had left in him fled completely. He melted into the chair as far as he could and simply let Emma continue. Her hands worked magic, teasing the entire length and bringing him ever closer to the release he so needed. Another huge drop, a veritable water-balloon of precum, fell from his tip and splashed on the floor. The puddle underneath was getting bigger by the second.

"Just how much do you have packed away in here? When's the last time you came?"

"This morning." Isaac groaned out. Emma's eyes shot wide.

"NO WAY!"

Isaac let out a weak smile. "Way. Sorry about the mess."

Emma laughed softly. "Well then, why don't I clean you up a bit?"

Emma worked her way up the shaft before resting at the head. Opening her mouth, she began to polish the top with her tongue, lapping up every drop that stained the tip. Isaac felt his dick pulse and throb as pleasure spread through the entire length. He tried desperately not to simply cum in her face right then. Then Emma leaned back again, and Isaac let out a small moan of disappointment.

"Oh. My. God. That was....that was delicious!" Emma smacked her lips, savoring the taste. Cum was NOT supposed to taste that good. She couldn't quite place what it was, but the flavor was amazing and she just wanted to have more.

Then she felt it. A warmth building in her middle. It grew, getting hotter and building every second as it spread to her entire body. The strange feeling overwhelmed her, setting every pleasure center in her brain on fire. She suddenly found herself in the throws of a mighty orgasm.

Isaac could only watch as Emma started to grow in front of him. The once lithe salesgirl with dark hair started to expand as her body processed Isaac's seemingly magic cum. Her thin frame thickened, tight clothing quickly becoming ill fitting as Emma fattened. Her small breasts pushed out at her top, the bra she wore now a few sizes too small. Her tummy poofed out, peaking out from under her shirt as she grew a small muffin top. The waistband of Emma's pants began to cut deeply into her hips. Her ass now strained the seams, bulging and begging to be noticed. Even her face rounded, becoming slightly fuller.

The transformation left Emma panting, evidence of her passions on display as a growing stain in her pants. Her eyes fluttered back open as she slowly recovered from her sudden burst of pleasure. Isaac watched as she looked down at herself, examining her new form. Her hands ran over all they could reach, as if asking if it was real. Then she looked up, her eyes locking with Isaac's once more.