I was at a concert and there was a brunette girl there who was 19 years old with MASSIVE tits, like E cups, they were wobbling all over the place and she had a bit of cleavage on show. I stayed "backstage" during one half and while everyone was in the main venue listening to people play (including her), I noticed her coat on the back of the chair I was sitting in. I thought about it being wrapped round her big breasts keeping them warm.
Needless to say, I whipped out my hard dick and jerked furiously, watching the door like a hawk! Anybody could have walked in, including her teacher! In less than a minute I blew a load directly onto her coat. I rubbed it into the fabric.
I then quickly grabbed some tissues and mopped up the mess. It left a stain on her coat but as it gradually dried over 20 minutes it was virtually not noticeable, it just looked like water
Nobody saw me at all, and I had zipped up and composed myself in time too.
To then see her putting on her coat and walking away, knowing that only an hour earlier it had my thick spunk smeared all over it, was hot!