Under the guise of sharing a shower, a curious sister can't help but sneak glances at her stepbrother's growing bulge. She playfully teases him, running her soapy hands up his thighs, before dropping to her knees, eager to taste his rigid cock. He hesitates initially but soon surrenders to her expert ministrations. She mounts him reverse cowgirl style, her tight ass swallowing his length as she rides him hard, her feet braced against the cold tile. He grips her hips, slamming into her, before pulling out to paint her ass with his hot cum.