Who Needs a Bathing Suit?!?

My step-sister catches me bare-ass naked in the hot tub. She just grins, peels her clothes off, and slides into the water with me. I manage a weak "what the fuck are you doing?" right before her hand wraps around my stiff cock and starts stroking like she does this every night. Feels wrong as hell since she’s my little step-sister, but her grip is so tight and smooth that my brain shuts right up. Next second she’s climbed onto my lap, lining that snug pussy up and sinking all the way down, taking every inch like it belongs to her. Water explodes out of the tub every time I slam up, pounding hard enough to make her tits bounce. Slippery as fuck, her walls grip and squeeze, milking me raw. When my balls finally twitch I yank out and paint her lips white—thick, ropey shots right across her pretty mouth. She licks it off like she earned the prize.