I was freaked out at the time, but this is the best experience of my life.
About three months ago I was at home with just my sister Mary who is 13 for company. We were just chilling in the lounge in front of the tv when the doorbell went. Turns out that two of my sister's friends, Becky and Jen (both same age as her) had been invited by my sis to use our PC which was in the study/office in the next room. I was fine with this because it gave me peace to watch tv.
Well it wasn't long before I heard them all giggling and I knew that they must have been looking at porn. I shouted at them a couple of times to keep the noise down because I could hardly hear the tv. Eventually I told them I was going to unplug the PC if they didn't behave. But this only made them giggle even more so I stormed into the study and made towards the PC. I didn't quite make it as both Mary and Jen each grabbed one of my arms and forced me to the floor and Becky sat on me so I couldn't move. I struggled like mad to escape but my slim 14 year old frame wasn't strong enough against the three of them. Mary told me to stop fighting them and accept that she was in charge. I reluctantly submitted and they let me sit up.
Mary told me that because I was so rude to her friends I had to do anything they wanted by way of making amends. I apologized but said that I wasn't going to do something just because they said I had to. This got Becky mad and she demanded that I strip naked for them. I told them there was no way I was taking my clothes for anybody. Of course this made Becky even more mad and she said that if I didn't get naked she would tell my parents that I had tried to have sex with her. This was a lie but I knew she would carry out her threat if I didn't do as I was told. So I took my shoes and socks off followed by my sweatshirt leaving me in just my jeans and boxers. The girls then squealed with delight when I undid the button and reached for my zipper and pulled it down. I let my jeans fall to the floor and stepped out of them. Now naked except for my white boxers, I was aware of what I was about to do. I begged for mercy but they all said that I had to go all the way. After taking a deep breath I pulled my boxers right down to the floor and stepped out of them as well but when I stood up straight I used them to hide my (hardening) dick. But Jen grabbed them from me and this left me completely exposed.
I thought my torment was over but the girls all agreed that I should now lie down on the floor and jerk off for them. I had been wanking for 2 years, ever since my 12th birthday so I knew I was capable but in front of my sister?? Becky reminded me of her threat, so I knew I had to go through with it. I laid down and grabbed my dick and started stroking. I shut my eyes and fantasized about the girls and it didn't take long to get super hard. I think I moaned a bit as I was really getting turned on at this point. My strokes were getting harder and faster and eventually I came in five spurts on my chest. The girls all gasped at the same time. Sweet Jen then used my boxers to wipe the cum from my body (she even managed a sneak tug of my dick). I was now completely shattered and sweating so I left them so I could go and have a shower. It wasn't until later that I realised that Jen had kept my boxers!
That was three months ago and despite many requests from the girls to do a repeat performance I haven't but yesterday Mary told me that my show had been caught and recorded by our web cam and if I don't do another show for her and ALL of her friends she would put that recording on the internet. I was turned on the last time but I haven't decided what to do yet. I will keep you posted.