Friends Curious Sister

Back when we were younger we had a friend who had a sister that was curious about some sex stuff. The one night we had a small gathering of friends over and one of them put porn on the tv. We were 16 or 17 years old at the time and that is just what guys do then wanna see some porn. Now his sister was 15 and wasn't there at the time the porn was on TV. Later on being silly guys were talking about one of the scenes we watched were this chick was blowing 5 guys we kept calling it a blow bang and how awesome that would be. Anyways she heard us using the term blow bang and pulled me aside while other went out for a smoke. She grabbed me and asked "hey whats a blowbang" uncomfortably but yet horney I was explaining this to her. You suck a group of cocks and they all give you a facial, she then asks whats a facial so again getting even more horney i explain thats when I guy cums on your face, all she said was oh my god! Sooo you suck a group of cocks and they all cum on your face at the end? Yes that simple. She asked me what is was like but I could not answer her because I have never done that and again she asks how does it feel on your face and again I could not give her a good answer. As I stand there witch somewhat of a hard on she just goes hhmm ok boys are horndogs and all I said was yes we are. The night is coming to an end and I just me, my friend and his sister that are cleaning up my friend tells us, hey I'm fucking tired and going to bed you can stay over if you want couch is free so I say alright cool ill probably do that and he goes to bed and its only like 1am. Anyways me and his sister finish cleaning up no big deal and just say alright good night, I go to the couch she goes to her bedroom. I fell asleep pretty quick but get woken up by his sister. She says come with me for a minute, we go into her brothers room and she trys to see how hard sleeping his and he is passed out, she shook him and nothing, so we leave his room and go back out into the basement livingroom where I was sleeping on the couch. I sit down she sits down next to me looks me dead in the eye and says I want to try the facial thing. She goes ever since you explained it to me earlier I wanted to try it it sounds really hot. I look at her and just say with me? I don't know if your being serious or if this is a setup she laughs saying no its not a set up you told me about it so I want you to do it to me. Needless to say I am super hard and kind of nervous but also was like, holy shit yeah I will cum on your face. So I whipped out my cock laid back and she started sucking. I askes have you ever sucked a dicked before and she only once but it only last like 10 seconds so I was like oh ok I will try and last longer(and I did just so you know almost 5 whole minutes lol) anyways she sucked and sucked and when i was ready I stood up above her told her too look up and i shot a fucking metric ton of cum on her face on her hair on her shirt over her head onto the couch it was just a mess everywhere. She laughed as each shot hit her in the face. She was taken back by the amount of cum and asked now what? I said now were done you go and get cleaned up and we go to sleep ok she said. As we got up the next morning I asked her what she thought of all that and she said she didn't not like it and would go it again. After that we were friends with benefits and sucked and fuck often for a couple years