The first real woman I saw naked wasn't my mom. It was my gran, my mom's mom. I was 14. My parents who were going to be busy agreed I would spend part of the summer vacation with my grandparents. Gran came to fetch me for the long drive that would mean an overnight stay on route and I didn't think anything of it. I liked her of course but it had never occurred to me to think of her in any sexual kind of way. She was just my gran and I didn't know about incest. Anyway, we checked into a motel just before dinner time and she took a room for both of us. That surprised me a bit but what surprised me more was the double bed we were going to share. Gran acted perfectly naturally so I did too. We had dinner then took a walk before going back to the room. I put my PJs on in the bathroom and got into bed. Gran watched television for a bit then switched it off and fished her nightie out of her overnight bag. I expected her to head for the bathroom in her turn. Instead, she casually pulled her dress off over her head and stood there in her cotton bra and panties. Now this was a woman of I guess 70 at the time and although she was solidly built, I saw she wasn't fat. In fact, she was quite shapely. I stared at her, totally fascinated but she seemed not to notice. That was pure pretence I later realised. I'd seen some of my dad's porn but nothing as old as gran. That didn't matter to me. I was seeing unveiled the secrets of a woman's body for the first time. She was talking to me as if it were the most ordinary thing in the world as she continued to undress. Her bra came off to expose large kinda droopy boobs and then her pants so that she was naked. I saw that she had a thick bush, so thick I couldn't see what it concealed. But when she turned and bent down to pick up her discarded pants, I saw not just her slit but her anus fully exposed. Seeing her big puckered asshole like that really blew my mind. Christ, I thought to myself, does she realise? Naïve me. She went into the bathroom to shower and came out still nude carrying a towel. She began to rub herself down right in front of the bed, turning casually this way and that so that I had a long view of her whole body and not once did she seem in the slightest embarrassed. Once she was dried off, she put on the nightie and got into bed saying it was time for sleep. I had a big hard on that I didn't dare do anything about and it was a long time before I dropped off. Nothing was alluded to the next day when we completed our journey or during my stay. Nor did I see her undressed again in any way but I didn't need to to beat myself silly every night. It was the start of what has been a life long sexual obsession with grannies. I treasure the memory of that night at the motel and I still get off on thinking that it was a terrific thrill for both of us.