I've always been a bit of a voyeur, and my stepsister is no exception. She's got a body that's just begging for attention, and it's hard to resist the urge to watch her as she goes about her daily routine. This morning, as I was getting ready for the gym, I couldn't help but notice her sitting at her desk, her tight little ass pressed against the chair. I knew she was alone, and the thought of getting a sneak peek of her in her most intimate moments was too tempting to resist. She's only 18, with a body that's just starting to blossom. Her tits are still small, but they're perky and firm, just begging for a touch. Her ass, on the other hand, is already a masterpiece. It's round and firm, and I can't help but fantasize about how it would feel against my dick. As I watched her from behind the door, I could see her fingers playing with herself through her shorts. She was teasing herself, her fingers dancing over her clit as she moaned softly to herself. I could see her nipples hardening through her shirt, a clear sign of her arousal. I knew I had to take advantage of this opportunity. I slowly undid my pants, revealing my hard cock to the world. I started to stroke myself, my hand moving in time with her own as she played with herself. I could see her watching me through the crack in the door, her eyes wide with surprise and arousal. The sight of her watching me only made me harder. I continued to stroke myself, my hand moving faster as I approached my climax. I could see her doing the same, her fingers moving frantically as she chased her own orgasm. And then, with a final gasp, she came, her body shuddering with pleasure as she felt her own orgasm. It was a sight I'll never forget, and I know I'll never be able to look at my stepsister the same way again.
