So as I have previously mentioned my SIL is a bit of a tease. I'm not going to give away the whole affair right now but I think you deserve a little bit more.

So me and my wife and my SIL and her BF went out for a night out together. We all got on well so it was nice to go for a few drinks. My SIL was wearing a corset top which made her 36c breasts look so pert and juicy pushed them right up so you could almost see her nipple. She was also wearing some tight black trousers, not lycra but tight enough to see the outline of her lace panties.

She managed to work out that I loved having the bottom of my back massaged and to her credit it drove me wild. Just a light bit of pressure around the base of the spine. She had been doing it all night even when her BF was around. So in return any time we were in a crowd I ran my hands over her ass and she seemed to love the attention.

We all got a taxi home and dropped her BF off first. My wife offered to let her little sis stay at our house rather than go back to her parents. I lent her a football shirt for her to sleep in and we all got ready for bed. We spent an hour or so in the lounge just chatting and having a few more drinks and watching a film. My wife was tired and headed off to bed I stayed up for another 20 or so minutes to watch the end of the film. My SIL put her feet up on my lap and asked me to rub them. Again it wasn't uncommon so I just gently rubbed her feet while we watched the film. She lay right back on the couch and the shirt lifted up so show off her laxey panties which were pulled tight up into her pussy. I could see her chubby little bald pussy lips almost hiding them. My hands started to wander up her legs but I chickened out at around her lower thigh.

She laughed and pulled down the shirt and we just kind of sat in silence while the movie finished. It was so hot I had to go and have a wank before bed so that I wasn't getting into bed rock hard and frustrated. She loved to tease but I never let it get too far. Over the coming weeks she pushed the boundaries further and further. She was driving me wild. But for months I managed to resist touching her.