The obvious.

The dull ache grew and grew until, just before it became painful, her dick gave a mighty throb that shook Sarah to her core. Her drooling member shook with her heartbeat, and with every vibration... Sarah's eyes went big. Slowly, her cock began sucking up more and more blood, the angry purple of its head slowly spreading down. Sarah grabbed the armrests of her chair tight, breathing hard.

With every throb and lurch, intense pleasure began mixing into the ache. Her cock felt overinflated, its skin too tight. Sarah began humping the air, little globs of pre splattering on her desk, and suddenly her pleasure skyrocketed. She came hard, doubling over in bliss, but no cum came spraying out. Instead, her whole cock pressed outwards from her crotch, lengthening towards her face.

Sarah leaned back and grabbed her cock with both hands, fucking her own precum-slickened grip. With every thrust, she could feel her length thickening and soon, the angry purple head began peeking out on top. Within minutes, she came again without shooting a load, her dick gaining a whole inch. Now, she was able to slide both hands up and down, her gasps long since replaced by loud moans.

Despite the overwhelming pleasure, she noticed something touching her inner thighs. Pulling her cock back towards her stomach, jacking herself off all the while, she saw that her balls had enlarged as well, with no sign of stopping. They sat on her chair, quivering with the need to be emptied, almost as big as golf balls. Sarah bit her lip, hoping that the new size wasn't just for show. Oh, the loads she would fire with that ammo!

While she had marveled at her scrotum, her dick had continued growing. The head had fully crossed the navel, pre covering her whole stomach. Another mind-blowing orgasm raced through her, again without letting loose her seed. She kept stroking her growing pole with delicious slowness throughout. After the marvelous feeling had subsided, she noticed that her dick had crossed the one-foot-mark and was now almost too thick for her hands to fully encircle it. Her balls, meanwhile, had reached the size of peaches, sitting proudly between her legs.

An idea popped into her head. Leaning forwards, she noticed to her delight that she actually could reach her fat cockhead. She slowly licked her slit, lapping up the salty pre pouring from it, a contented hum resonating through her. She had always quite enjoyed sucking dick, but giving herself head was a first. An enjoyable first. Stretching her mouth over the oversized helmet, she began sucking and circling her tongue. Her own moans set her dick on fire with lust and she began humping upwards, facefucking herself.

The insane stimulation soon overwhelmed her and this time, her oversized balls tightened. With a muffled yelp, she blasted rope into her own mouth - the first shot alone eclipsing what she had used to fire in a full orgasm before. Coughing, she reared back, hips still bucking, her cock firing another load straight in the air. The huge glob of cum had not reached the apex of its arc when she spurted again. Her dick twitched madly, making her back arch, and finally her second shot hit her chest, covering it liberally with her cum. Her other shots splattered all around and over her - she was dimly aware that the amount was inhuman, but the pleasure blotted out almost all conscious thought.

After what seemed like an eternity of orgasm, Sarah came to and took stock of herself and her surroundings. Several pools of cum covered the floor of her room, she herself was drenched. Her cock had softened, but even soft it put most pornstars to shame. Sarah's balls had become nearly as big as her fist, hanging heavily in her scrotum.

She thought about the possibilities of that huge tool and the amount of cum. Would she even fit into Adam's snatch? Oh well, nothing a bit of Growth-X couldn't fix.