A little backstory

While Aster was being taunted by the corrupted fairies, the human watched idly. He felt a surge of power and arousal whenever he saw his little demonette's: something so pure so utterly corrupted by his efforts. He'd felt bad in the beginning, that his harmless observations had transformed into unethical testing, but after he realized how easily he could control the little demons (and the supernatural power they held) he'd started sliding down a very slippery slope.

He'd known of the fairies for years now (not that anyone believed him or even stopped to examine his proof) and he'd captured a few on and off to examine them in closer detail. He'd quickly become aware of their intelligence though to this day he couldn't understand their speech. They were very sensitive to their surroundings, particularly the emotions and auras ("vibes") that they were exposed to. He'd noticed they reacted strongly to his emotions, particularly when he was angry or frustrated.

Then, two years ago, he'd been particularly frustrated with...well, everything. The life of a scientist who studies fairies isn't easy. Point being, the fairies were more riled up than ever. Most of the time he could contain them with strong enough metal cages but this time, maybe drawing on his own frustration, they burst free from their confinement.

He'd only been able to catch one before they all escaped, squeaking frenetically as they angrily whizzed off into the woods. They had a surprisingly strong bite (not to mention the magical sparks they could throw) and he'd grabbed the first thing he had to wrap her up, which happened to be a certain garment covered in semen.

He'd tossed the fairy into an unbroken cage and hadn't even realized the effects until later that day: the fairy was running her hands over her body, obviously uncomfortable but not sure why. He'd been fascinated by her unknowing lust and the following day he'd decided to up the fairies exposure. He placed her, still not completely clear-headed from her first encounter, in a test-tube and dripped several mL of his semen in with her.

As one of the drops struck the fairies chest the result was instantaneous: her eyes rolled up and her back arched, tiny high-pitched squeals emanating from her as she had her first orgasm. Tearing off her dress, she massaged the musk into her skin, slipping down the glass till she was literally bathing in cum. She orgasmed again as he watched intently, the spasms coming closer and closer together as the cum almost seemed to absorb into her body. Eventually there was nothing but the fairy in the tube, weakly quaking with aftershocks.

She looked less...fairylike. Her skin was flushed and her color had faded to more earthy tones, not the vibrant floral color she was before. She also seemed to have lost her wings, a fact she quickly discovered and cried for hours over. He had felt terrible and had sworn to himself to help her return to normal...except he found her masturbating in her cage the next day. The sight was incredibly erotic considering the size difference and it wasn't long before the fairy spasmed in orgasm and slumped, panting in her cage.