I took off my clothes and sat on the exam table waiting for the doctor. When he came in I was relieved to see he was an older gentlemen in his 60's; a...nice looking guy with graying hair. He seemed quite professional giving me little reason to feel embarrassed in front of him.He performed the normal set of exam procedures and then he asked me to stand up in front of him while he sat on a little stool. He spread his legs and pulled me a little closer to him and told me to lower my shorts. I knew. After all, by now they pretty much had to be aware that I was in the house looking for them, and they'd apparently done their best to ignore me.Or at least that was the way I figured it as I turned the knob. Three inches of open door, however, showed me that I'd figured it out all wrong.I quickly pulled the door closed as what I'd just seen fully registered with me. The reason Fred and his mother hadn't responded to my rattling around their house had become shockingly clear.No wonder they. My cock was now straining at the seams to get out. My mother saw me shift uncomfortably to try to hide my dilemma, and, following my gaze, saw what I was looking at. She reached down and covered herself up saying, " You seem to have a problem, Jeff. You shouldn't be looking at your Mother like that with those thoughts in your head." I'm sorry Mom, It's just that I know how much you miss Dad and I've watched you finger yourself and call out his name. I'm sorry that I think your so damn sexy.. Your still lying back, tied up and cannot stop staring at us. I position us just on the floor beside u, so you can see everything, i get ur sister to lie on her back and start rubbing her now, soaked thong, leading to gently pull it off with my teeth. after that with 1 hand gently massaging her small perky tits i lower my head, using the other hand to part her lips and gently start licking her clit, moving slowly to tease her before nibbling at it and then finally sucking at it, i gently push.