Funniest Thing Ever!

When I was 15 my boyfriend was an 18 yr old senior. When the parents were gone my older sister was in charge but she was cool and would let my boyfriend come over so we could have sex.
Well one night something happened. To set this up I have to disclose my boyfriend was quite g*fted. Like 9 inches! I learned to deepthroat him but only in one special position and he REALLY liked it. I would get on the bed, facing up with my head hanging off the side of the bed. In that position he was able to push his large member down my throat. Every time we had sex he had to have this and I didn't mind. When we would really get into it he would grab my wrists and hold them by my side as he fucked my throat. I would choke and gag but it was so hot!
This night we were really into it and he got carried away. He shoved his cock in my throat and held it there too long. I was choking, gagging and legs kicking but that was normal. I couldn't breathe and actually blacked out. I don't know how long he kept going until he noticed I was out.
He freaked out and started screaming for my sister. She ran in the bedroom, we were both naked and me looking like a dead girl with a face covered in spit and precum. After a minute I started coming round.
We were so embarrassed having to explain but we all laughed our ass off after.