The steam from the hot shower fills the room as I stand under the cascading water, my hand wrapped around my throbbing cock. I'm lost in fantasy, imagining my step-sister's hands on me, when suddenly, the shower curtain is yanked open. There she stands, her eyes locked onto my stiff dick, her breath hitching in surprise. I freeze, my hand still around my shaft, as she watches me, her gaze intense. I can't help but groan, my climax building, as she licks her lips, her eyes never leaving my cock.