I never did it again!
One night when I was 13 I felt VERY horny. I had just begun to masterbate and I got out of bed, made sure my parents were asleep and undressed. Then I sat down in the family room and started to masterbate. I was just about to cum when someone switched on the light. There my dad stood and out of pure shock I came all over him. Luckily he did not spank me but just gave a talk about masterbation. Today I still masterbate thinking of that day I came on my dad.