Spying on parents

When I was 13yrs old, one night I woke in the middle of the night and heard some noise from parents bedroom. After a few secs I realised what is going on in there. Another night was the same. After some time I found out that my parents have sex at the weekend, so I stayed up till night, waited to my parents to get into their bedroom and after that I sneaked out of my room and ***** on them. Usually I was watching them through keyhole, sotimes they let the door slightly opened, so I could take a peek.
I saw mom sucking dad's big cock, till the cumshot. I also seen mom riding on him, but mostly dad just take my mom like a whore and fucked her really hard. Dad didn't care that I can hear them, especially when he was cumming, he shouted all over the house. Mom tried to stuff his mouth with her panties, or hand many times, but dad was still so loud.
I loved to watch them and wank my hard young cock....