This happened when I was 16.

I was staying over night at my Granny’s place. In the morning I woke up with my usual hard on. At the time I was a frustrated teen that had not had the pleasure of having a girlfriend. ( I guess that’s just an excuse) well I was laid there slowly stroking my willy when I had the thought of gran pop into my head. So I started thinking of sexual fantasies while slowly stroking. Well the fantasy that came was myself standing in the bedroom facing the door with Willy in hand and my gran would walk in and catch me.

So I put my perverted little fantasy into action. I waited for my gran to knock and enter my room with a morning cup of tea. I’m not sure on how long I was waiting, the anticipation had my heart beating that hard and fast I thought it was going to burst through my chest. It was then that I heard her footsteps, I increased my stroke rate and waited for the knock. The knock came, my knees started trembling and I said nothing. She knocked again then slowly entered the bedroom holding a cup of tea. I was now up to maximum speed and we locked eyes. She then began to stare at my cock, it was then I shot my load and it flew towards her. Luckily it fell short and landed on the floor. Gran put the tea on the bedside cabinet and walked out with a look of disgust on her face. The excitement of that wank was one of the best I’ve ever had.

There was an uncomfortable silence for quite awhile. After the wank I went through the stage of feeling disgusted with myself. Not for long though as my next wank was a memory of that experience.