It was in the summer of 99 that she caught me masturbating in my bedroom. I had come home from school and I was really horny for a girl that I really...liked in school. Her name was Heather and she was a really good looking girl, that day she had worn a pair of short shorts and I stared at her legs whenever I could in class. So I got home that day and there was no one home as usual. My parents got home late from work and my sister got home about two hours later because of her tennis training.. Lying in bed kissing and playing with each other got me horny but was in need of my sister’s hand and mouth so asked if she could show me again just how she uses her magic mouth on my cock. Tina kissed me on the lips before sliding herself down to lay between my legs and covered my cock with her warm moist mouth, her lips tightened around my shaft, l watched my cock disappear and the swollen head hit the back of her throat, l gasped and held the back of my sister’s head which began bobbing up. Great toothy smile. She's 47 years old, slightly round but well-proportioned.We cut up pretty well while checking in, and I found her to be slightly shy but also quite coquette-ish. Our conversation became pretty wide open in short order, and I found she flirted as much as I. She finally handed me my keys and, winking, said "Anything you need, just give me a call!" I was stricken, to say the least.I settled into my room, put things away, all-the-while thinking of the excellent & arousing. I slipped my panties off to realise there was huge white creamy patch in them and that my vagina was extremely wet. I peed quickly and mopped up some of the moisture.I returned to the bed and wanted to see if he noticed that I was now naked. He did! I then said I simply had to take my underwear off in the bathroom. "Do you mind?" "Er no, but I have never seen a woman naked there before" he blushed. "I take it you approve" I smiled glancing at his erection. "Oh yes but I am afraid I can't.