My pervert dad is the horniest

It was my sister's wedding, we had invited my gf and my room was connected to my parents room. Till her marriage my sister and I shared room, after marriage she left so i invited my gf to my room for sex but I had forgotten about connecting room, i went to say goodnight to my parents before starting with gf, mom said goodnight and fell asleep dad was in washroom then i came to my room and started with gf, she was riding me in reverse cowgirl when dad walked in from connecting door then he said oh sorry and left then he woke mom up and fucked her so hard that she screamed more than my gf