The spells one shouldn't cast

Inside the book there was lewd pictures of peoples fucking or getting fucked by tentacles or horned beings. But also some texts written by hand with enluminures. It was clearly old, just by seeing the thin yellowish paper and some half erased parts of the pages. Hermione got herself caught in the feverish curiosity of Luna and looked at everything with great curiosity.

As time passed, arousal was slowly starting to grow, and with the pictures, they started to fantasized about what it could be in reality to be ravished like in those pages. Finally, Luna broke the silence.

"Magna ascensio in voluptatem dantis"

"Luna !! Don't read out loud the spells !!" Hermione scolded her.

"Don't worry, I don't even have a wand on me."

But that wasn't controlled magic they were used to, wands were fairly new in the magic world in the grand history of mankind. A tingling went down their spine and their pussy started to grow warmer by the second. It quickly became unbearable to not please themselves, but they were still proper ladies and Hermione excused herself first.

"I-I have to go..."

"Y-Yeah... I'm going too."

Luna closed the book and both girls left the library, almost running to their shared room. There, they couldn't help it but throw themselves at each others. Furiously kissing and taking off each others clothes before reaching the bed. Hermione laid on her back and Luna went down between her friends legs to eat her out. The redhead moaned all her contempt as she felt a growing pleasure pushing away something from her. Nothing physical or magical, something hard to pin point, but, it was going straight to Luna. The later was surprisingly enjoying a lot pleasing her friend, like if she was filled with something that was absolutely enjoyable.

Hermione was surprised to feel her friend tongue going deep in her pussy rubbing her insides with great talent which made impossible for her to worry about the implication. Not did she notice how they did that for hours before Luna crawled over her looking different, more androgynous, with hairs shorter, her tits almost inexistant, maybe also taller ? Which wasn't a bad thing because her attraction to woman was going lower by the hours. Luna was in a feverish state too, she was feeling somehow stronger and even more attracted to woman than she ever been. And damn, Hermione was looking fine at the moment, with larger hips and tits, long unruly hairs, and smaller ?

The redhead felt something pushing in her pussy, hard and warm. She wanted to ask what was going on, but Luna kissed her, sending an unbelievably long tongue down her throat. Which someone brought her even more pleasure. Luna had her clit that had grown the size of a man's dick, it should have shocked her, but instead, she felt the intense need to use it. And so, she fucked her roommate like a man would do, she also used her tongue to please her even more while squeezing her big tits.

Hermione woke up from what felt like a dream, alone in the bed. But quickly she realized that it wasn't a dream at all. Her body was perverted one more ways than one. She had gained several pounds, most of it had gone in her breasts and ass. Her hairs had grown down bellow her butt, while she seemed to have lost at least five to six inches in size. She could also feel her pussy drooling all over the sheets like a nympho.

"Like... what... what happened ??" She said, shocked.

"Oh, you've woken up ?"

Luna got out of the bathroom and looked completely different. Short blond hairs, androgynous face, almost six feet tall, shamelessly naked with almost no tits and butt. The giant clit she had last night was nowhere to be seen as it reverted to its original size. To Hermione, she was incredibly sexy, between pretty and handsome.

"Luna ? You look... like... uh... not the same... What's going on ?" Hermione asked, realizing that it was really hard for her to think.

"It seems the spell actually worked, honey bun, I'll look into it later." Luna explained, putting on the school outfit.

The redhead jumped out of the bed, her tits bouncing as she walked toward the blonde. The difference in size was even more obvious now, she was almost a feet smaller than her friend.

"No ! Look at me ! We need to like, look into it now !"

Luna pulled her tongue out, it came out by six or seven inches, twirling like a tentacle before getting back in the blonde's mouth. She smiled apparently satisfied by it and turned gaze toward Hermione.

"You're gorgeous, honey bun. I'm sure Ron will love playing with those."

She then grabbed one of her tits and squeezed it. The feeling was overwhelmingly good, Hermione moaned instantly and she could feel her pussy throbbing while drools run down the inside of her thighs.

Luna then left the bedroom confidently, leaving a really horny bimbo Hermione.