I stood in the dimly lit room, my heart pounding like a drum in my chest. My name is Emily, and I'm just a regular girl who's dipping her toes into this whole submissive thing. I've been seeing my trainer, Kaiden, for a few weeks now. He's tall, strong, with those piercing blue eyes that make me feel small and safe all at once. Tonight, he told me we were going to explore something new—my ass. I'd never done anything there before, and the thought made my stomach twist with nerves and a weird excitement I couldn't shake.

Kaiden guided me to the bed, his hand firm on my lower...