Need more stories. Keep them coming.
The first part of this ended with my sister walking in on Kailee and I masturbating. My sister (Michelle) is 16 (15 when this happened), about five foot six inches tall, 115 lbs, brown hair just past her shoulders, 34B tits and a nice ass.
Back to the story now. I was just about to cum, and saw Michelle standing there. Kailee was still masturbating and hadn't noticed Michelle. Michelle then asked, much to my surprise and joy, if she could join in. That's when Kailee realised she was there, and started to cover up when Michelle said not to. She also said she wouldn't say anything to our mom about it (my parents split when we were young). So I looked at Kailee to see if she minded and she told Michelle yes, to join in.
Michelle stripped down and joined us on the bed. I had my erection back and started stroking again. Michelle went back and sat next to Kailee and started rubbing around her trim pussy, getting more wet as she went. Kailee was now rubbing her own clit while Michelle continued to finger her. I was still masturbating, looking at the two beauties in front of me, and loving every second. Michelle was now using two fingers and gently pushing them in and out, while Kailee was working on Michelles pussy now and getting ready for her own second orgasm (third if you count the one before my sister joined in). I was just enjoying the sight and felt my orgasm coming. It hit me and I started shooting cum everywhere. I was catching my breath when Michelle had her orgasm. She started using her fingers faster while having it, and shortly had a second, while Kailee had another one. We all sat there resting for a bit.
The three of us hopped into the big jacuzzi tub, and started washing each other. We all paid special attention to our now sensitive areas. I was done first, and started drying off while Michelle and Kailee finished washing up. When they were done, we all got dressed and acted like nothing had happened. Our mom got home about 20 minutes after we were done, and never suspected a thing.
More to come, and sorry it's taken so long, I've just been fairly busy.