<human>: Give me a shortened version of the text

My GF and I were camping with her family and had to share a tent with her younger sister and her sisters boyfriend. Her older sister's family was using their trailer that was parked right next to our tent. 

I'd been living away from my GF all summer and we both were feeling particularly horny one morning. The younger sister had gotten up and left the tent but had left the door open a little because it was rather warm out. Her BF was still in the tent sleeping. So my GF and i decide to start playing around a little bit but didn't go any further than things with our hands. 

A day or two later i get told by my GF that her older sister had apparently looked into the tent and that she saw us having sex, which she of course denied. Had the younger sister's BF not been there we would have probably owned up to it but, with him being in the tent passed out there was no way in hell we would have heard the end of it. Over a year later we still get asked about it and just keep denying it.
<bot>: Got caught getting a HJ in a tent with GFs sisters BF sleeping next to us. DENY DENY DENY!