Sunlight pours through the open garage door as you blink up at your girlfriend's face grinning down at you.

"You good down there?" she asks, her voice slightly deeper now but still carrying that playful lilt you know so well. She stretches your arms above her head, making your muscles flex in ways you've never seen before. The way your broad shoulders move under your old t-shirt is... distracting.

You swallow hard, rubbing at your neck where your skin fuses with hers. "This is so fucking weird," you mutter, and your voice comes out a little bit higher than usual. It's embarrassing.

"Weird?" Your girlfriend barks out a laugh. "This is amazing!" She pats your chest with your own hands, then freezes. "Oh my god. I don't have boobs!" Her eyes go wide as she presses both palms flat against your pecs. "It's so firm. I never thought being flat chested would feel so nice!"

You groan, struggling to sit up in her more petite frame. The sundress clings to curves that aren't yours, the fabric tugging against your delicate skin. "Help me up before I faceplant in this damn dress," you grumble, holding out a hand that looks so small it's unsettling.

She grabs it easily, hauling you upright with surprising strength. "Whoa," she breathes, looking down at where her small hand disappears in your large one. "You're, like, super light now." She lifts you a few inches off the ground just to test, making you yelp.

"Put me down, you ass!" You kick out with legs that feel too slim, too weak. The motion makes the sundress ride up, and you scramble to pull it back down with a flush. "Jesus, how do you deal with this? Everything's so... floaty."

Your girlfriend just grins, setting you back on your feet. "Aw, but you make it look cute." She pinches your cheek with your own calloused fingers. "And hey, at least you helped pick out the dress."

"Yeah, when it was going on your body!" You swat her hand away. "God, you're enjoying this way too much."

She flexes your biceps, watching the muscles jump under your skin. "Uh, duh? My head is on your body, babe." She runs your hands down your own torso, pausing at the waistband of your jeans. "Do you have any idea how long I've wanted to try this?" Her fingers …