When he was younger I would babysit my brother Joe - diapers, baths and putting on pajamas. He got older and didn't want or need my help any longer. But, our parents still left me in charge when we were alone.
Late one stormy evening this past summer when our parents were out and the lights were down low we got to talking about when we were younger. I suppose it was embarassing for him to talk about me taking care of him. Thinking about the little boy now no longer little and his dick, I was getting really horny and started to get wet.
When the thunder started and he got scared we sat closer together. This was too much and as the older sister I steered the conversation to when I would bathe him before bed and wondering what that would be like today.
I asked if he would like that? He was reluctant, but I suggested I could wash his back in the warm tub. With a little push he went to get ready.
I changed my robe with nothing on underneath so 'I wouldn't get wet'. Yeah, right! I wanted to show off my boobs and maybe if Joe was lucky he'd catch a glimpse of my wet pussy.
Soon enough, he answered yes when I asked if he was ready. I went in the bathroom and found him in the tub with his back to me.
I soaped my hands and started washing his back. I made several passes over the top of his ass crack and then suggested he get on his hands and knees. I guess he didn't need much encouragement. Now I could reach his whole ass and eventually inside his crack. I could feel him shuddering. His dick must have been rock hard by this time.
Then I worked my hand in that area behind his balls. Boy, were his balls hard! I could reach his dick and began stroking away! Soon the inevitable result was all over the tub and my hand. Yes, little brother could definitely cum!
He turned around and saw that my robe had fallen completely open. I don't need to tell you how wide-eyed he was and his dick looked like it was ready for round two.
I got in the tub to let him wash my back. He washed me the way I washed him. It didn't take me long to cum.
Then I just took hold of his hard dick and slowly stroked him until he came all over again.
Since then we go right to the tub once our parents go out.
In the tub the clean up is easier.