My Back

"My back please. I can never scrub it on my own." Sarah said. You figure why not, so you get up, now standing in the tub naked with your sister, who is also naked as she hands you the pink bar of soap. Sarah turns around, presenting you with her small, thin back. Your gaze goes from her slender shoulders down to her hips, which widen a bit on the way to her round, heart shaped butt. You started scrubbing Sarah's shoulders with the soap and your suds covered hands. "Mm that feels good, go lower." You then move your hands lower, scrubbing your sister's shoulder blades and lower back. Her spine shivers as the sensation tickles her back. "Mm... lower." Reluctantly you start scrubbing lower until you're rubbing her cute round bubble butt.

As you scrub your sister's ass, a little part of you, most likely your conscience, is telling you this is wrong, but you just can't stop yourself. You caress Sarah's little ass cheeks and then give them a small squeeze before Sarah bends down and starts to grind her ass on your leg. If she was taller she would be grinding your crotch, you note. Before it goes any further, Sarah stops and turns around. "Thanks Doug." She says, as if nothing sexual happened just seconds prior. Sarah then grabs the bar of soap from you and starts lathering herself up. You watch as the soap rubs all over her body, her pert young chest, her smooth stomach, and finally her thick cock and balls. "Now turn around so I can do you." With that said you turn around so your back is facing her. Since you are taller than her, she has to get closer to you to reach your shoulders, and as she moves in, her slippery erection slides right between your thighs. Even though she is younger, her girl cock is still larger than yours, and it stretches out further so you see her cock head passing yours.

You try to tell Sarah about your personal boundaries but the only thing to come out was. "Um Sarah..." Without saying anything, Sarah pulls out from between your legs.

"Oh sorry Dougy. This thing is so big that sometimes it goes where it doesn't belong."