‘Bend over and put your hands on the wall’ I said, at which point I heard an audible in take of breath, but that paled into insignificance with he...r cry as I pushed my dick deep inside her. Holding still momentarily I said ‘ look at the sea’ and as she did I started to thrusting into her slowly, but very firmly. Every time my hips met the cheeks of her arse, Julia moaned, which was making me hornier and hornier to the point where I could hold back no more and I thrust into as quickly as I could.. I saw that they were getting very sweaty, I think they might have been extra horny because I was watching, I wasn't sure, but what I was sure of was that I couldn't hold my load anymore, the show I watching was just too hot."Shit, you two are gonna make me blow too!" I screamed.They both looked towards me and watched me just explode all over the floor."Holy shit mom," They both said."You two are the sexiest couple I've ever seen in my life," I replied."Thank you," They both said.Brian made sure. “Stand” She yelled, and Her command was emphasized by the sound of a slap, followed by the stinging sensation on my left nipple. It’s interesting how difficult it is to stand, when you don’t have the use of your arms. I struggled and twisted my body and eventually was on my feet. Carol then tugged at my belt, opened my slacks and pulled them down. She guided me to step out of them and I was now naked, sans my shirt twisted around my wrists, along with the Velcro. I then felt Carol’s incredible. Her mom knew something had happened, but didn't say anything. So as we chatted, I noticed Becky drive up.I was so hard already that it was almost impossible too keep from being noticed, so I excused myself, saying I needed to put some tools away and finish up some things in the shop outside before we headed home. I made it to the shop outside and texted Becky. I told her where I was and for her to come out and find me. But instead, she texted back, asking why her sisters panties were on her.