Well there went ethical boundaries...

After that things pretty much went downhill, morally speaking anyway. He'd masturbated in front of the fairy, making sure she knew exactly where the musky fluid had come from. She'd watched intently, fingering herself and coming with him. She'd cautiously stepped into the tube when he placed it to her cage and fidgeted nervously as he prepared the semen, but she laughed ecstatically when the fluid touched her skin and the orgasms began again.

For every following session it became increasingly obvious she had become addicted to his cum, becoming more and more docile as he presented it to her. Her figure grew fuller and fuller with each "session" but it wasn't until the sixth or seventh exposure that the other physical changes started to manifest: the red skin, the claws, the tail.

His working theory was that his own thoughts had caused the changes to manifest: he'd always gotten off on the idea of **** corruption and the demonic figure that blossomed on the fallen fairy was a wet dream come true.

After the transformation he'd switched from cumbaths to feeding her his cum with a pipette. It kept her happy but more needy and energetic, more able to listen and learn what he wanted. Eventually he was able to drill some basic understanding of english into her and he had a lot of fun after that, getting her to perform little dances and masturbate for him. Despite her demonic appearance, she was really quite docile for him.