Before the sex story starts, let me give the stats of two girls who are the characters in this story. My sister Priya is cute, she has a perfect body ...s she goes for aerobics daily and Aparna is beautiful she has boobs bit more than my sis, trust no one can leave her without sucking her boobs.Now coming to the story we are a family of 4 members my parents,my elder sister priya of 28 year’s and me of 26 yrs. We live in a 3 bedroom flat, my parents sleep in one bedroom, though I and sis had. Ah !There was a smile and a confounding expression on her face as if what had happened was normal.Could you step behind a little please? She slowly controlled her ass with her hand.She wanted to know if she was getting wet.And, I also slightly moaned while pulling back my penis.And, I was still ejaculating slightly.fffff!Pretending as if I was talking about stationery products I said to her;(Actually I was meaning her ass)Your stuff is pretty good, too.She did not reply.She went to the behind. Then I felt my arousal start to rise again and once more she delayed the inevitable. Eventually, I was babbling my need to her and finally she didn't stop and allowed me to complete my journey in a climax so strong it seemed that my whole body was involved with every nerve ending on fire. I felt consciousness slipping away.I opened my eyes again to see her mischievous face inches from mine."I trust that you enjoyed that?" Enjoy? You drive me halfway insane and then make cum so hard that I black. She can’t say anything more. I can’t stop myself smiling.The nighty was just below her waist and deep cleavage can be seen. I consoled her, don’t worry no one will see in night. She was bit uncomfortable. We sat on back seat and again I put my one hand around her shoulder and another on her bare thighs and said relax- Sweet heart, nothing will happen. For the 1st time I called her ‘sweet heart’. She said nothing and put her head on my shoulder to relax. Her eyes were close. As I was touching.