Cathy hadn't been dating Paul long, but they had sex on their second date, and he was probably the best lover she had in terms of both size and skill, and he also always seemed pretty ready to go ...
It didn't completely surprise her when he slipped into the bathroom, naked except for boxers he was sliding off, announcing: "Hey, it's me! Coming to join you, babe!"
Cathy realized she had left the shower on, she was so distracted by her transformation.
She saw Paul enter, stroking his dick, already half hard, and start to head to the shower before he noticed she was standing outside of it. The room was full of steam at this point, semi-obscuring his view.
"Whoa," he said, wrapping his arm around her neck and shoulders, and the other around her waist, as he pressed his forehead against hers: "Someone is looking exceptionally hot today. You even smell particularly ... sexy. "
Cathy started to speak, but she couldn't seem to concentrate. She had just masturbated to at least three or four orgasms, but she could feel his erection poking her, and growing harder. It felt like her heart was beating in her pussy.
"Do you want to ...?" Paul asked.
She could only breathily sigh affirmatively.
She felt him pulling her into the walk in shower. She heard herself moaning as he sucked her giant nipples. Then he began to feel at her crotch.
"Fuck, you've never been so wet!" he observed. "Still, a little lubricant never hurt."
She heard a rubbery squirting sound, and then Paul was inside her a second later, lifting her against the shower wall.
Her eyes closed tight as she felt her enhanced pussy taking over for both of them, just like she imagined it would, with a cock inside, clenching and stroking and manipulating his penis.
He began by thrusting into her, but soon, even though Paul was still holding her up by her supple ass, supported against the shower wall, she was really fucking him, he was letting her pumping pussy do all the work.
Her pussy edged him to orgasm several times before instinctively backing off, and rising repeating the cycle, driving both of them to a higher climax when it finally happened.
Paul began to moan like she had never heard him do before, as he approached ejaculation, but just before he came, he inexplicably slipped out of her.
He determinedly thrust in again and began to get back into rhythm, but seemed to be having trouble staying in her pussy again.
She lowered a leg to steady herself and reached down to help guide him back in, but to her shock, she fumbled for his dick before finding that he wasn't hard anymore ... had he cum ...? But ... no, he was trying to put it back in her, too, he wasn't done, it was just, it ... seemed so small all of a sudden ... her hand closed around it ... he suddenly moaned ... maybe only three inches? Cathy gasped. Paul's dick was shrinking in her hand.
Her eyes snapped open, and she saw what was unmistakably a woman's face staring back at her.
"WHAT'S WRONG?" Cathy heard a woman's voice ask.
"Did you use my new bodywash as a lubricant!?" Cathy said, knowing the answer.
"Why!? What the fuck is going on, I ..."
Paul's words were cut short by Cathy kissing Paul full on the lips, and tonguing frantically for at least a minute. Suddenly, she felt herself ten times more turned on.
"What---!?" Paul gasped again as they came up for air. This time Paul was silenced by a moan, when Cathy's hand slid down to Paul's genitals.
Cathy felt heat from the steam of the shower, and internal heat from her own lust. She felt her huge tits press against Paul's small but swelling new breasts.
She opened the shower door again, and pulled Paul out and wiped off a streak in the mirror, pointing.
"Don't you get it, you idiot?" Cathy smiled. "You turned yourself into a fucking girl, haha"
Cathy was glad Paul was much lighter, as she catches the fainting girl and guided her slumping, naked body to the floor.