I loved that feeling of being stuffed with his cock a lot now. And was always ready and excited. I jerked back onto the cock and it was kind of thrill...ing sort of being alone in the booth with only Freds cock sticking through the glory hole. It was then I noticed another hole in the opposite wall. And an eye there watching me. A finger came through, and then a tongue. I was afraid but didnt dare move away from my side of the booth. A cock came through the other glory hole, hard and throbbing. I. The whole situation made moth of us excited. I made her lean against the dirty wall and started kissing her. My hands were feeling her wait at that time and my dick was pressing against her pussy. She suddenly pushed her tongue deep inside my mouth. She had a really long tongue which was exploring my mouth and at times I could feel it in my throat. This extreme tongue action made me grab her ass and squeeze it. Wow it was huge and soft and felt amazing on my hands. She moaned a bit inside my. He then told me he was putting his black dick inside my cunt, for medical purposes only.I gasped and begged to put it in me. He inserted his hard cockhead in my wet cunt and asked how it felt to me. I was gasping and I could not answer…He said then my cervix needed some expanding to keep it flexible. Then he pushed it deeper up in my wanting pussy. The Doctor told this was an experimental treatment. He said if I would like to keep giving it to me at his office or would I rather have him come to. So after tht my sister backed off a lot we never discussed it again and we used to be normal bro and sis as we didn’t have any feelings as it was happened at our childhood now me and my sis had a common room we had our beds attached in our room so tht we can discuss things abt our studies so it happened to be like tht for daysNow my sis was 15 and i was 16 .I was growing as a man and she was equally growing as a women once i was ill and was sleeping on my bed my sis returned from school and.