Rupali was 20 @ dat time, wheatish 36-26-38, simmi was taller,littele dark but same dimension. It was winters, so i was being cuddled rather squashed .../w my own sis and simmy. We were talkin about schools and gfs n i told them i didnt had any, and then i told y do i need a gf. Simmi told me that means u dnt know nething, i asked about wat, (i was nt faking my innocence) c said bout reproduction. I gave her all the biological detail. Then rupali who was listening from bhind my sister leaped in. I ran and hugged my dad " oh dad i love it, its so perfect i love you " i said happily " i love you to baby,im gonna make u happy " he told me to go shower so i did and returned to him he was sat on my bed waiting with two new bags these are for you he told me i looked in the bags and seen girls clothes i hugged him again telling him how thankful i was " just get ready dinner will be waiting and dont forgot to put your make up on " he said walkin out of my room make up i thought to myself is he. Once she got the door, she turned to look at him, giving a sign that could not be misunderstood…Ten seconds later, the black man stood up and he went to the bathroom; he looked funny, trying nobody could see him moving.I left yet another couple minutes and then I also got the same way as both of them. I entered the place quietly, hearing some muffled sounds from one of the stalls.I went to the next cabin and climbed up the toilette; to sneak on the other stall. I found a nice unexpected show. Then I went few steps back and saw her structure clearly.Then I was in full mood. I removed my inner and went to her. I slowly removed her pants down and she was about to turn back. I pushed my cock into her pussy in a hurry.She started screaming and asking me to remove that, and saying we can’t do it. She said that she was my sister and I cannot fuck her.I said you are not my sister and started ramming her at full pace. After some time, she realized that there is no way to escape and decided.