They start to tighten

Turning back to the mirror, the reflection still lacks your recent endowments, and for a while you're content to stare at your old body, satisfied with how cute you look in the t-shirt and skirt. It shows a small line of midriff between the two pieces of clothing, but even as you watch the mirror, it seems to expand. With the limited capacity of your mind, it takes a while to realize what's happening, but your reflection's clothes appear as if they've started to shrink, slowly covering less and less of what used to be your body.

The tightness in your chest starts to intensify- it was noticeable beforehand, but now it's constricting your breath, pressing your ample breasts up against each other. A quick look back at the mirror shows your reflection, now naked and sporting the enlarged bust and hanging cock of your current body. She gives you a sly smile before turning, giving you a great view of your own ass, pussy, and the underside of your penis, before walking a few steps away and sitting down.

The clothes continue to constrict, and you realize that something must be wrong, but your shirt has become too tight to pull off, its fabric completely clutching the outline of your skin. Teased by the pressure, you can feel your nipples pushing more against the shirt, hardening to points and making it feel as if there was even less room in the steadily shrinking outfit. At the same time, the skirt's waistline is pressing into your skin, already past the point where you could slip it off, though you try regardless.

As your hands start to pull at the material of your skirt, a loud ripping sound echos through the room. The shirt has finally given, tearing apart in small shreds as your bust breaks through, the torn remnants of the shirt still hanging on at the sleeves. Your skirt has risen to the point where almost the full length of your cock is on display, only covering the very point where it meets the skin of your groin. You hear a similar ripping sound, and the skirt's waistline gives out as it falls to the ground, leaving you wearing only the ripped remains of the green shirt.

The sense of being completely naked and exposed again is somewhat excited, and you can feel your heartbeat quicken as arousal spreads through your body. In the mirror, your reflection has laid out across the ground, and is quickly stroking her cock, another hand buried between her legs. Even as you watch, she bites her lower lip and a stream of cum shoots out, leaving white lines across the ground where it lands. It keeps coming, too, spraying out in a vicious fountain, slowly coating the surface of the mirror. After a few more seconds, the mirror has completely become a shade of opaque white, leaving you standing almost nude in the middle of the room, questioning what to do next.