You're cleaning your room when you notice your girlfriend's swimsuit crumpled on the floor: a pale blue bottom and a white top with frills. You feel a strange urge as you ignore the compulsion and continue tidying. All control is lost when a voice in your head screams, 'Put them on.'
You tremble, stripping your clothes off as you grab the bikini top and snap it into place. Ignoring a strange tingling in your chest, you swiftly fasten the bottom into place and turn toward your body-length mirror. "W-- What am I doing?" You stammer in confusion.
Your body is overwhelmed with a hot, prickly sensation as you question your strange actions. You gasp, your voice climbing many octaves as you watch your reflection in awe. You rapidly lose height and muscle mass, every inch of your body softening. "Hnng!" You grunt as your waist pulls inward and your ass expands. Simultaneously, your new tits bud and quickly pass an A cup in size.
You should be disturbed, but the transformation quickly grows blissful. You let out a low, sultry mew as your genitals throb and recede inward. Your new ears sprout atop your head while a cashmere-soft cat tail juts from the base of your spine and extends outward.
Instead of experiencing terror, you marvel at how beautiful you're becoming. You caress your breasts and probe your crotch, feeling the moist folds of your labia taking shape while your cock recedes until it's nothing but a small, pink nerve bundle.
As your testicles take their place as ovaries, your vagina and urethra open with a slight pop, marking your complete transition into womanhood.
As your ears twitch, you can't help but grin at the sensual cat girl in the mirror. How will your girlfriend react to going from one to three pussies in the house?