Bob on his friends house

I had got drunk with a mate (George) and was in no state to drive home so he said I could sleep on his settee. His Mum brought me a duvet and when she left the room I took off my jeans and made myself comfortable... A few hours later I awoke, needing a pee. I managed to find my way to the bathroom and did my stuff. When I'd finished, I opened the door to find George's Mum standing there completely naked! "Oops she said, I thought it was my husband in here (he apparently worked shifts and she thought he'd come home early...) but she made absolutely no attempt to cover up... She is not exactly my type she is, er, very large, and was 44 at the time; I was 19!! But my willy didn't seem to mind and to my horror I got an immediate full erection which made my boxers tent right out. She went red, smiled and said something like "Well you're a responsive young man!" Next thing i knew, she was in the bathroom with me, french kissing me! It was REALLY weird but I did feel VERY horny. I could feel her breasts against my chest and she'd put her hands down the back of my boxers and was rubbing my bum. she was a bit mad... she almost tore my boxers off and i was standing there completely naked with my penis sticking up!!! She said "You've got a cock like a big banana" (mine has a pronouunced upward curve when its hard...) I really wanted to touch her pussy but somehow felt I shouldn't. She stopped all thoughts along those lines when she took my hand and put it between her legs. It was so wet there I thought maybe she'd peed herself!! But feeling that wetness made me almost cum on the spot. I felt a kind of urgency to fuck her and I somehow think she wanted the same thing! She faced the wall and stuck her bum right out and said "Come on Bob, put it inside me" Well i fumbled around and eventually got a little way inside her. She was very wet and the feeling of that was just too much for me and I came before I'd even started to thrust. Oh Dear! I felt highly embarrassed by that and my willy lost some of its erection... I pulled out and she started rubbin her own cunt!! A bit surreal really but horny nonetheless. She was really rubbing fast and I think she eventually reached orgasm. My cock had stood right up again by that time and I went to put it inside her but this time she was having none of it and insisted we should stop. So I went back to the settee and remained awake for the rest of the night. Honestly, I think I had a non stop erection for many hours afterwards... Anyway, I've never repeated the experience with her but I always get an immediate hard-on every time i see her. All very weird!!