“Wow! So now you want to experiment more things, and you’re going to fuck Matt too, huh?”“Shut up! I won’t do that! I told her we could get ...ll together. You know… Have a foursome.”“What do you mean?” I asked naively.“Gosh! That means I want to do this with you. Don’t you think Joanna is hot?”“Well… She’s fine… I mean… Yes, she looks good.”“Okay, so what do you think?”I ended up accepting my sister’s proposal. We would have a foursome with our friends. I had known Matt and Joanna for a couple. "Do you want me to fuck you?" he asked as the tip of his cock pressed lightly into my pussy lips. "Yes" was all i could say. i didn't even stop once to think about any consequences, i never once thought about a condom. as soon as I said yes he started rubbing his cock head up and down my slit, getting it lubed up in my juices. he got the tip entered just barely then he stopped, looked me in the eyes."I have been wanting to do this for years." he said as he thrust one quick hard motion and his. By this time my top was above my bra as she cupped my 44DD in her hands, it was good. I unclipped my bra and as my tits were released she was rolling my nips, as I were hers.After another few minutes I ran my hand down over her chubbiness and touched her through her pants, she moaned and then said “Shall we get in the back”. I pulled apart and nodded. We got on the back seat, and it was a big car therefore the area was massive. I kissed her and again we were frantically snogging as I unbuttoned. The fucking session I had with her was more than amazing. As I had mentioned things got a bit wild after that she had one more adventure for which this story is.From a few days she was not feeling well so we visited a doctor, the doctor advised us to get some tests done from a pathology lab. The test included blood test and x rays of chest. We visited the lab in the afternoon and there was a bit of rush so the pathologist just took the blood samples and asked us to come later at 4pm to do the x.