Yoga pants

You start with the bottom half first choosing a pair of her yoga pants. Pearching on the edge of the king sized bed you pull them on one leg at a time. They are uncomfortably tight, especially in the crotch, as you stretch them over your hips and up to your waist. For a moment you worry you won't be able to get them fully on but there is just enough give in them to manage it despite the fact that you are almost a foot taller than her.

As soon as you let the waistband go you feel the tingle of transformation take hold. The thin fabric clings tightly to your manly legs gently squeezing them into a more feminine form. Your thighs thicken and swell and you feel the seat of the pants pulling taut as your ass expands. There is an audible pop as your pelvis suddenly widens forcing you to adjust your stance in order to accommodate your new child bearing hips. The pants pull even tighter riding up between your ample cheeks.

Finally you watch in fascination as the bulge in your crotch slowly shrinks away the sheer material soon outlining the cleft of a vagina.

"Oh fuck" you groan rubbing at your freshly minted camel toe "I love this power!"

The tingle between your legs intensifies even as the tingle of transformation ebbs away. You can feel the heat of your new sex, an aching need unlike anything you're ever experienced before.