Rarity's slowly became aware of her surroundings, the familiar floorboards of the Library's lobby being the only thing present in her vision. As she gained feeling back in her extremities she also began to realize she was face down against them, body sprawled awkwardly across the floor. Rarity noted the dampness of her entire body, a sticky residue not unlike sweat coating her from head to toe. Groaning in slight disgust, she attempted to command her limbs to move. The dull ache of over exertion came over her, "Ugh... Did I just run a marathon?" The sound of a quite chuckle caught her attention and she looked up hastily.
Twilight Sparkle sat legs crossed and chin resting in her palm. She stared at Rarity hungrily, eyes half lidded and a smug grin plastered to her face. Rainbow Dash sat adjacent to Twilight on the couch with her mouth hung slightly open. Rarity's gasped silently as she realized what she was looking at. Legs spread wide, Dash wore a loose fitting gray t shirt and nothing more. Both hands worked rhythmically between her legs, manipulating her bare blue slit. Two fingers buried to the knuckle, she pulled harshly into the sides of her pussy. The flesh gave way, and in time with her ministrations wide stretches of pink peered back out at Rarity.
Greeted by the display of public masturbation by Dash, Rarity gasped and moved to stand. Her sore muscles caused her to stumble, and she quickly realized as she peeled herself from the floor that she too was nude. Now on her knees, she cupped her bountiful breasts in one arm in an attempt to conceal them. The other hand pressed firmly over her vulva, and she noted upon contact how drenched her palm immediately became. A pulsing she failed to notice until now stirred in her loins, one she recognized as the afterglow of an orgasm.
"What's going on, how did I get like this?" Rarity pleaded, confused and worried. Twilight once more chuckled openly, and Rainbow Dash continued to roughly gyrate her fingers, filling the room with a sloppy squelching sound. Twilight sat back onto the sofa and uncrossed her legs. Now able to take stock on Twilight's form, she noted her open white button up blouse, the subtle curves of her breasts peering out between the parted garment. As her slender purple leg rose from the other, she gave Rarity a quick flash of her glistening vulva beneath the black breezy skirt she wore.
"But Rarity, you told me you'd love if I made you feel... Good" Twilight drew the last word out sensually. Rarity began to quirk an eyebrow, but before she could vocalize her confusion she jerked forward into a hunched position. Rarity groaned loudly, feeling an intense pressure in her crotch. She reflexively pressed her palm into her groin as pleasure flared up inside her. Humping into her hand erratically, her labia parted as her vaginal walls contracted violently. A sudden and powerful orgasm overtook her and she screamed silently, unable to take in air for the moment. A pressure built up in her winking snatch, and she spread her lower lips reflexively. Nearly falling over she jerked her knees apart and nearly slid into the splits.
A surge of liquid came forth and sprayed forcefully into the hard wood, Rarity's hips jerking involuntarily with each powerful spray. For several seconds she convulsed and analogously timed jets of feminine ejaculate accompanied each quake. Rarity quickly formed a puddle and collapsed onto her rear into it, splashing gently into her own excitement. Rarity wavered and managed to keep herself from falling over through sheer willpower. Several seconds of stammering gave way to more confused questions. "... Tw-... Twilight I don't... Don't understand what's happening." Rarity let her arms fall limply at her sides, tired from what she could surmise was another orgasm in a series of many before it.
Twilight stood up and took a tortuously slow few steps closer to Rarity. Stopping just shy of the puddles edge, she stooped forward to lock eyes with Rarity. "You agreed to let me put you under a trance while I tested a new spell. I rewrote your neural passageways associated with... Well, you can tell. I'm now able to stimulate your brain with keywords and certain actions." On queue Twilight extended her hand and made pinching motions at the air just an inch from Rarity's heaving breast. Rarity withdrew slightly, but her lust addled mind stopped her movements. Grinning at Rarity's meager resistance, Twilight slowly took Rarity's nipple between her thumb and finger, and rolled it gently.
As if she were turning a fleshy switch, Rarity's voice picked up into a loud moan and she thrust her bosom forward. Once more Rarity arched her back and picked her pelvis up from the ground, clapping a hand quickly over her dripping flower once more. She wrest her petals open once more as Twilight's touch incited another mind shattering orgasm. Her mouth hung open and a dollop of drool spilled forth. Clenching her eyes shut she once more concentrated on the tightening of her inner walls. Another deluge of Rarity's nectar spilled forth, sloshing into the already substantial quagmire pooled at her knees. Rarity emit a high pitched squeal and after several seconds of gushing onto Twilight's feet fell back onto the floor gasping for air.
Coming down from another magical orgasm, Rainbow Dash's own pleasure must have peaked as she picked her feet off the ground, curled her toes, and redoubled her fingers harsh thrusting into her own pulsing core. Buried at maximum depth Dash bit her lower lip and held silent for many seconds, the only movement from her throbbing tunnel milking her fingers. She relaxed and fell limply back on the couch, however her fingers began anew, slowly working back out of her trickling passage.
Twilight stepped forward, her feet splashing into place on both sides of Rarity's waist. She squatted down and leaned onto her knees, her skirt raised due to the angle to give Rarity a full view. "Since it's not a physical stimulation per se, there is no real stopping point... You've been able to come for a long time today... Even if you have blacked out. Feel good for me again." Rarity rolled her neck and cried out once more, flailing aimlessly around on the ground, and arching herself up with her legs. Not able to articulate herself well enough to manipulate her lower lips, she just scratched at the wood of the floor. Her pussy clenched and unclenched again, a much tamer stream of ejaculate dribbling out limply. "Just keep feeling good. Then feel good some more."
Rarity's entire body fell with another splash. She writhed in pleasure and her weakened stream revived as she was debilitated with pleasure. Twilight gave a subtle "Ooh~!" and bounced on her heels as she felt a warm splash of fem cum wet her rear and the section of skirt hanging over it. Rarity's moans silenced and her eyes closed more naturally than they had last. As her labia once more slid back into place, the tides of her pleasure stopped, and she blacked out.