Boyfriend did me my first time

I was at home and I could hear my sister and her boyfriend,so I thought I would look at them from the top of the stairs and see what was going on. They were nakid and his penis was in her mouth then pussy and then asshole. Then he arched his back and let out a moan. She was moaning loud and then she had white stuff on her face. As she was licking it off her fingers as she rubbed her face. He heard me on the steps as I started to go up them,and he said we see you now come down here. I walked down the stairs and went to them he said what have you scenes us do? I told them and he questions me about his white stuff on sisters face. Then he said we are nakid so take your pajamas off. I did and he was playing with his penis and I was super hard. His penis is huge,he asked me if I wanted to touch him and I reached out slowly and it was like touching my arm. He laughed and sis said it is ok to touch it. So I held it with both hands and thought there was room for 8 more hands. He asked me if I ever jacked off and my sister laughed and said mom has cought him several times playing with his penis. Then he said so you play with your penis? I said all the time. Then he showed me how to jack him off then he said put your mouth on the end of it, my head and lick it. My sister said he was going to give me the same white stuff and I needed to swallow it all. Then he came in my mouth and I swallowed it. He then jacked and sucked my penis and I dry came a couple of times as it felt great. He said let's teach him to do it again. Then he came 2 more times in my mouth and I swallowed most of it and I liked it. He left the house and he was there almost every day and I swallowed him a lot. He was watching me put my feet behind my head and he tried to get into my asshole but he was not able to get in for 3 years of trying, but he was able to squirt cum in my butt if I was pulling my cheeks apart. That always felt great when he dided it.