I was so horny but didn't want to risk it. After we had finished our tea I told frank I needed to use the toilet. The toilet in the house was downsta...rs and from the living room you could see into the loo so I made my way into the toilet making sure to leave the door open, I unzipped my jeans and pulled out my cock, it wasn't hard but it began to grow as I shook on it just hoping frank was up for some cock,I had finished my wee and stood for a few minutes stroking my tool but frank didn't. . .These are the external features of my sister know to me till then .It was summer holidays . . . Me and my sister went to khammam,to grany’s home .This is where I got a golden chance of fucking my sister . . . .My uncle and granny live in that house . . .My uncle regularly goes to clg at 8 in morning . . .And my granny takes some rest about 2 -3 hours . . I started watching porn as my sister went for a bath . . .2-3 videos and my dick was raising up to fuck someone .It was then my sister’s. She asked if we could do some stuff tonight I smiled and said sure we can. She swan over to where I was and put her hand straight on my cock and squeezed, this was to become her trademark, we looked each other in the eyes and she said stand up so I did and she just went straight to sucking and licking me whilst wanking the shaft. I was pretty amazing I must say, to have an 18 year old sucking me, whilst I looked down at her beautiful glistening eyes. After just a few minutes she stood up sat on. "I heard quite a bit of shuffling and movement and then Jackie told me to sit down in the chair she had brought over from my desk.I sat down and she took my arms and tied them behind the chair, then I felt my feet being tied as well. I know my cock was like an iron rod. The girls were getting a good eyeful of my favorite body part, that's for sure.Then one of them kissed me, probing her tongue in and out of my mouth as I felt my left knee being kissed and licked. Holy shit, I was being.