Sisters friend

The other weekend my parents were out of town and my sister and I were left home alone for three days. My parents had told us no friends were to stay over but on the second night my sister had her best friend Erica stay over, I have always had a bit of a crush on her even though she is a year and a half older than I.
Both my sister and Erica are in their senior year and will be heading to college next year, They do everything together so it was no surprise when they said they would be going to the same school and living together in the dorms. Erica is uber cute and curvy, Perfect legs, Beautiful booty, Small waist and flat stomach, Big ** and dark, curly, Shoulder length hair. My sister is a little taller than Erica and has a more athletic build, Slim, Toned, 36C (I may have checked her bra before) and blonde.
I had been laying in bed when I realized my sister had been on my Ipad so I went to ** at her since she is always using mine when she has her own. I walked up to her bedroom door and didn't even think to knock but opened the door and almost died, Erica was flat on her back, Legs spread, Rubbing her beautiful ** lips with one hand and pulling her one big ** hard shaking her ** with the other and my sister was on all fours straddling Erica's face with her ** toward me. I stood there for what seemed like an eternity but was actually probably only 10 seconds before my sister looked back and freaked.
She jumped off Erica, Kneeing her in the side of the head as she did then lost her ** screaming "GET OUT" and grabbed something off her dresser, I didn't wait to see what it was but I slammed the door and whatever it was sounded like it was coming through when it hit. I bolted for my room and they both showed up a minute later, My sister was losing her ** for me not knocking while Erica stood there looking unimpressed as she attempted to scold me. Finally I told her to get out and she did but a few minutes later there was a knock on the door, My sister opened the door and came in looking embarrassed and started to apologize but then she said "You can't say a F'ing word to anyone EVER", We argued for a minute or so and then she left and Erica came to my room, Erica sat down and begged me not to say anything to anyone but I said "Well...What's in it for me".
She got up and left and both of them came back, My sister said "What the ** do you mean what's in it for you", I said "Well, You get to have my silence but what do I get?", My sister grabbed Erica's hand and they stormed out of my room, Honestly I don't know if I would have ever told anyone but I was standing at my dresser and had my phone in my hand when they came back, I turned on the video camera and set it on my dresser. My sister said "What the ** do you want?", Looking back now it was maybe a weird thing to say but I didn't really expect anything to happen anyway but I said "I don't know...Maybe you should just do what you were doing before", My sister looked at me and then at Erica then back at me and said "What the...What is wrong with you, You want to watch me sit on Erica's face?". I was like "Well...I...I don't know...I mean", My sister said "Yeah...No...Never gonna happen ya ** weirdo, We were thinking maybe Erica would ** you off but..." and before she could say anything else I said "Ok...Yeah", My sister looked at Erica and said "Holy **" and Erica said "I don't...Whatever..." and shrugged her shoulders looking at my sister.
My sister laid out the ground rules and said "Ok f'**, This will happen one time and one time only and you can never tell anyone about anything that happened here tonight", I agreed and I don't know why but when my sister went to leave I said "Where are you going?", She looked at me and scrunched her face up saying "What?", I don't know why but I had a feeling of power at that moment and felt like I was in control, I said "You have to stay and watch her", There was a short argument before i said "Ok then get out" and they left, I thought I had screwed myself over and was thinking about how to rewind when they walked back in. I never even noticed my sister had a small ** in her hand but she said "Ok...We don't really have a choice so...Whatever ya f'ing freak", I said "Ok, Both in just your thongs", I could tell my sister was at her boiling point and decided not to push for anything else but they both took off their shirts and shorts leaving them both in just their thongs.
My sister said "Ok, This is your f'ed up ** fantasy so what do you want?", I told her to sit on the bed and lean back and pulled a chair up in front of her, I sat Erica down in the chair and my sister said "Are you f'ing serious" and I just smiled, I stood in front of Erica and she pulled my underwear down then leaned back and looked at my package, She cleared her throat and said "Well...I didn't see that coming" and I said "You will", My sister was staring at the ceiling and took a deep breath then sighed and said "Don't f'ing talk, For the love of..." and just shook her head.
She was staring at the ceiling in my room and I said "You have to watch her", She looked me in the eyes and said "What is wrong with you" then she looked at Erica and at my package, I could tell she was surprised when she tried to talk, She stuttered "um...Uh..." then closed her eyes, Shook her head and looked at Erica saying "Good god make this quick", Erica wasted no time and opened her mouth pulling me toward her, My sister looked at me, Bit her lip and shook her head.
I motioned toward Erica and she started watching, She was obviously angry and just sat there shaking her head as she watched Erica, Erica looked amazing and she had absolutely done that before, She reached up and pinched my ** while sucking me and although I tried to hold out I could only last about five minutes before I said "I'm gonna come" Erica started sucking harder and I reached over grabbing my sisters ** and reached down grabbing Erica's at the same time. My sister put both hands up and said "Ahhh...What the f'ck" but i squeezed both as I blew my load in Erica's mouth, She kept sucking and swallowing until I couldn't come anymore and then my sister handed Erica the **.
Erica looked up at me and said "Hold this, You are gonna use it on me" and without thinking I grabbed it, Just then I heard my sister take a picture and looked at her, I said "What are you doing" and both her and Erica got up, left the room laughing. I wasn't really thinking at that moment but sat down and in a minute my sister came back, I was laying there leaning back and she looked at me saying "For f'ck sake put you d'ck away", I said "F'ck you, Get out of my room" She said "well before I do I just want to show you something". She showed me two pictures, One of Erica sucking me and one of me holding the ** looking down at her as she looked up at me, I shrugged and looked at her and she said "If you ever tell anyone about what happened here" Then she held up the picture of Erica giving head and said "I'll tell people you can only get off when you have a ** in your **", I looked at the picture and Erica had her hand between my legs and I thought she was grabbing my ** to pull me toward her but she was making it look like she was sticking something in my ** then she flipped to the one of me holding the **.
So...Now I'm screwed I can't ever tell anyone without fear of her exposing my fake fetish, Oh well, It was still fun.

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