To masturbate in them

It was an afternoon just like any other at the owl house. Luz had managed to learn about what it feels like to be sexually aroused in diapers.

Luz set the book down and began trying to translate it to a glyph. A few hours later Luz had drawn up a glyph for the spell. Luz nervously got up and pulled down her trousers. "Here goes nothing" she thought to herself as she placed the glyph on her crotch. The spell activated and in a flash of light a diaper appeared around Luz's waist. It was white and very thick.

Luz was now getting very horny thinking back to what her girlfriend Amity said about her mind going blank and decided to add a hypnosis glyph to her diaper as hypnosis had always been one of Luz's biggest turn-ons. The diaper glowed a purple hue for a moment and then faded. Luz couldn't contain her arousal anymore and her hand almost subconsciously moved towards her padded crotch. Luz started to rub her diaper relishing how it felt in the palm of her hand. She'd never masturbated in a diaper before as Amity was her girlfriend. She masturbated a lot but this… It felt so different but so good. Luz let out a moan "O-oh god" as she felt herself reach the edge of an orgasm. Luz came hard filling her diaper with a warm, sticky mess. She collapsed to her knees gasping for air as her diaper was now full of cum. After that intense orgasm Luz felt so sleepy and decided to climb in to bed.