I had mixed feelings when my parents told me that the grandparents were coming to stay for a few days and they would need my room. I resented being booted onto the living room sofa, but I was interested in seeing grandma again for the first time since I was 13. Now I'm 18 and a sucker for big tits, and I recalled grandma was very busty. They arrived late and went right to bed but I caught a glimpse of grandma and she looked even more busty than before. She had gained some weight making her even more voluptuous.
The next morning I heard someone in the kitchen early so I got up to see and it was grandma making coffee. I must admit the sight of her in a loose sleeveless, knee length nightgown made my dick shoot right out of my boxers. Her gray hair was up and she was in slippers so she was showing tons of skin. What really made me reel though was the shape of her big tits, belly and ass that you could see through the sheer fabric. It was a plain, raw, natural and awesomely sexual look for a guy like me.
When she saw me grandma looked me up and down much as I was looking at her. She seemed to smile appreciatively at my lustful gaze and perhaps at my big hardon. I'm a swimmer with that kind of lean body so when I'm hard it really stands out. "My my you've grown into a big handsome young man, Johnny" she remarked somewhat flirtatiously I thought. I decided to return the volley in kind saying "and you really fill out a nightgown nicely grandma." We went on like that for a while, making flirty comments to each other, and hitting it off well.
I was getting so hot for grandma I decided to make a bold comment. "It's too bad you are my grandmother because you really are the type I go for." She responded somewhat coquettishly "ooh Johnny, you make your grandma wish she were your girlfriend." Her response emboldened me. "If you were grandma I'd fuck you right here and now."