Guess who came to vist

So Thursday my sister shows up to spend the holidays with us. All good nothing happened that day or Friday but Saturday night my k**s were out with friends and my wife out last minute shopping. I was in My room just laying on the bed watching tv. Here comes my sister in a Big T shirt and lays down opposite me so her feet were near my head. She asked what I was watching and already I can feel me getting hard. I tickled her feet a few times which made her shirt ride up . I mentioned the color of her panties, but that didn't make her pull her shirt down she just wiggled her ass side to side that gave me the do what I want message. I slapped her ass and then pulled one side up of her panties and slapped her naked cheek. Then worked my hand up into her panties and started to finger her very wet pussy and she laid her head down on the bed. I couldn't do more since it was getting late. Monday my Wife works and my k**s will be out all day so I'm planning on introducing my camera into some very wrong sex. Hope I'll have something to post.