First Time

I was 13 years of age going to a Christian school where they never taught anything about sex. One day in the summer I got to spend the weekend over one of my best friend's house. However later at night after going to bed and getting up to get a drink being thirsty going to the kitchen to get a drink of water my friend's father was still up on the couch masturbating himself and noticed I was up. He beckoned me to come talk on the couch. He did not even cover himself but held his erect penis in his hand saying to me as I was sitting on the couch " Here is $20 if you get on your knees and suck me". I did not know how to do he told me how. I put my mouth around his large cock and did the best I could. That was the first time ever tasting a guy's cum.