I sat down at my desk and she stood behind me and placed her hands on my shoulder " ooo… you do have big shoulders, you must work out a lot " i laug... and remarked " yes you cheeky person " she giggle and sat down next me like normal . i do go to the gym a lot, i'm quick built and tall. later in to the lesson nothing really had happened until she reached over to get a pen on the other side of me and squeezing her hand on my crouch. i didn't move, startled with whats happened. she carries on. I let her shower then as she is leaving still with my eyes closed I say " was that fucccck in a nice way when you looked at my cock Miss " I look over to see her holding the towel across her front, catching a glimpse of her ass in the mirror I throw the covers back gripping my hard hot cock I start to stroke it. Louise stood there watching smiling for a moment her hand behind the towel moving as if its rubbing her pussy then she ran out flashing me a bit of breast as she left.That evening. I wondered if anybody was watching us and looked in the glass to get a reflection of the room behind us. I noticed a few guys looking at intervals as they worked at different positions. Henry and Randy were on the other side of the room by the barbells. Oh well, This may take a little more time than I had thought. Thats alright. I wasn't in a rush.I was starting to feel it after only 15 minutes. I was breathing harder and my face was damp. I wasn't ready to wimp out in front of Janet though. I. I struggled up the ladder, my balls hurting from the kick and I was embarrassed that my sister was staring at my exposed genitals. I wrapped the towel around my waist and proceeded to the cabin.“I’m taking a shower,” I called out as I went up the stairs. The lake water had been cold so I ran a hot shower, got in, and began shampooing my hair.“Matt, do you need anything?” Fiona called to me from the hall.“No, Fi, I’ve got everything I need,” I shouted while rinsing my hair.“Are you sure?” Fiona.