Their bodies become an Anal fetishist's wet dream

It was hard to tell who noticed first that their bodies were changing. It was definitely Willow who noticed the sudden thickening and lengthening of the wriggling tongue that was now buried deep in her asshole, the stretching sensation now sending bolts of pleasure straight to her brain. It was as if someone had rewired her ass to be the main pleasure centre of her body and she was loving every second of it as she felt the wet and squirming tongue explore deeper and deeper into her hole. If John hadn't been otherwise occupied she might have been able to tell Willow that her ass now tasted like pure sweet honey, the intoxicating taste driving her to push even more of her ever growing tongue into her mistress' now stretched hole. "Oh my god yes slut. Just keep doing whatever it is that you're doing! Oh my god!" Willow screamed as she felt her **** redouble her efforts to please her mistress.

Increasing the sensitivity of their assholes was just one thing the book of lust had in mind for its newest possessions. In both women it began to fulfil all it wildest fantasies. They were unaware that its power had grown so now it could mould the fabric of reality itself, such was its design and purpose. Unlike Willow, John would have no need to complete the same grooming ritual as her sister in faith. Hairs below her neck began disappearing into the ether forever, her pale skin being left unnaturally smooth and soft along with its sensitivity heightened. Her dark hair on her head began to become pure, obsidian black and fill with a volume models would kill for while it lengthened to fall just below her shoulders, ending where it would draw the eye to her delicate collarbone. Like Willow, she now felt a loosening in her ass and she somehow instinctively knew that she'd very much enjoy stretching and ruining her hole to achieve the greatest pleasure.

Both women felt their breasts firm up and fill out. John being smaller than Willow had in turn slightly smaller tits, their new size being perfectly suited to her slender frame as Willow's were suited to hers. Their asses also began expanding and becoming juicier until they were the perfect bubblebutts that every woman would die for. The book continued to raise the sensitivity of their assholes until they were even more sensitive than their pussies ever were. It increased their holes stretchiness so they'd be able to take huge things into them and feel nothing but pleasure. Stretchiness is not to be confused with elasticity ;) once these holes are stretched, they're staying loose, gaping and dripping their natural lube on the ground, as all assholes should.

Once happy with the corruption of the girls assholes the perverted book shifted its focus elsewhere. Their tongues changed to now be completely controllable in every way. They could extend indefinitely and thicken to the size of coke bottle all while being completely malleable. Every hole in their bodies could now be stretched and fucked, even the ones god never intended. Well....not 'that' god anyway...

Having spent its energy for now, the book settled back to gather more power from the lust filled sluts. Its work on this convent only just beginning.