What caused that? To wet? Too open now?That's when I noticed the mirror. To my left I noticed her dresser with the big mirror. I started to cum just a...little, I had to fight to hold it back again. I could see myself in the mirror fucking my naked grandmother. It was one of the hottest things I've ever seen. I watched in the mirror as I fucked my grandmother and couldn't help but ask her: "Do you like it grandma? Do you like getting fucked by your grandson?" I was so horny I was sounding like a. My hand moved from squeezing and fondling her breasts to rubbing on her panty covered slit. Our playing continued when my sister broke our kiss. Her breathing was fast and bothered. One hand grabbed the back of my neck while the other squeezed hard on my cock. I continued to rub her cover nub as her body started to tremble again, followed by squeaks of joy from her lips. Just as she started to come down from her orgasm there was a noise at the door. Then a loud "Clunk" as the brace bar. So, I slowly went to my mom and hugged her from behind. At that time, my cock touched mom’s bum and it felt wonderful.I was hugging mom like that for 30-40 seconds without moving. The feeling was so good and erotic. Actually, I had done this many times when I was a kid but nowadays, when I do it, it feels sexually arousing and my cock automatically becomes fully erect.I kept pressing my erect cock on mom’s ass. I guess she didn’t mind it or maybe she was silently enjoying it as well!Mom: Ohh. I had no plan to get out of the room, but I figured that the first step would be to get out of the ropes. From there I could look at what to do next.I struggled against my bonds, but they were too tight. I tried cutting them with my sharp nails, but couldn't get at the rope.I thought for a bit, maybe I could use my double jointed fingers to get at the rope. With some effort I bent back my fingers to the point that I could touch the rope around my wrists, and with a bit of sawing I started to.