I remember one day I was lying by the pool working on my tan. Unfortunately lying in the sun always has a way of making me feel kinda horny. So back in my bedroom I put my favorite Offspring CD on as loud as it would go, after all, my parents were at work and wouldn't be home until 7pm. I was lying on the bed just sort of feeling around and rubbing my nipples through my bikini top. I was absent mindedly looking at my half finished coke sitting on the dressing table and got this idea that the bottle might provide some fun.
Anyway, after having drank the last of the coke, I set about having some fun, rubbing the bottle between my legs or tracing circles around my nipples. After a while I had this idea of getting onto my knees and then sitting down on the bottle. I just pulled my bikini to one side and tried rubbing backwards and forwards but the bottle kept on falling over. After a while and more by mistake than design I sat down more than I should! I was in heaven! the nice thing about the bottle was that the neck was quite thin but it quickly got fatter. I found that if I grasped the headboard I could easily control how deep it went inside me. Unfortunately for me, my back was to the door. at first I thought I was imagining my name being called through the noise. A few seconds later I heard it clearly this time: 'Lana!'. I jerked my head round to see my older sister, home from college staring at me with a look of amazement on her face. It's difficult to know what to do when you are caught with a coke bottle stuck half way up your pussy, so I just dived for my towel and held it over me. I could feel my face burning red with embarrassment.
To her credit though, she never mentions that day, even now. But I have a big problem drinking coke in front of her and my solo sessions are a lot more tame.