This happened when I just finished my graduation and was heading for my masters. We (my sister and I) are extremely good looking. My sister got married to Javed (a muslim guy) who is very handsome. Actually it was a love marriage. Initially my parent was against of this marriage but later they accept it. They stay in Delhi. My M.S entrance was in Delhi so I reached the place a few days before. Javed stay here with his younger brother Tariq. That night, I was preparing for my exam and I was studying. It was about 10:30 pm and quite & calm outside. After a while, I heard some creaking noise from their bed room. I switched off the TV and sat quietly on the sofa next to their bedroom door. My Brother-in-law was making love to my sister (34-32-36 her stats). I quickly understood what was going on and thought of getting out of their privacy range. But, it was night and it was a small apartment there wasn't any choice left. I slowly walked up to the wooden partition that was separating the bedroom from the hall and their love making sounds became quite clear now. Their bedroom was dark but the dim blue night lamp was good enough to see them. His hands were stretched out over both her breasts. He began lifting up on the bottom of her bra, trying to pull it up. My sister reached around behind her back and unhooked it for him and it fell away in his hands. He looked at her full, soft breasts. Creamy white, firm with erect nipples. My sister bent over a little, her beautiful breast wavering only inches from his mouth. He instinctively licked his lips, then placed his mouth softly over her nipple and areola. My sister gasped lightly as he took it into his mouth. She placed her hand on the back of his head, holding his mouth against her bosom. Meanwhile, she continued to rub her crotch against the bulge in his pants. She was already so excited and her clitoris swollen from rubbing against his erection. As he suckled liked an infant, his right hand moved slowly from her other breast toward the elastic of her sweats. He moved it gently over the soft bulge between her legs. He pressed a little harder, which solicited a gasp from My sister's mouth. He pulled his hand back and slid it into her sweats, but over the silky softness of her panties. He stroked her for many minutes, at the same time switching his mouth back and forth between her breasts. Finally, he pulled his hand back and slid it into her underwear. He had no trouble sliding two fingers into the mouth of her vagina. "Oh Bhagwan (God)." she moaned in a whisper. He worked his fingers slowly back and forth into her vagina, each time he penetrated deeper. My sister arched herself back away from him, allowing him to pull down her sweats and panties all at once. She then twisted around on the bed, slipping out of the remainder of her clothes. She lay facing him, naked. His shirt was partly unbuttoned; a situation which she soon remedied. He pulled her bare breasts against his chest and he began to kiss her passionately. Their tongues were clashing and their hands were moving furiously through each other's hair. He pushed her to her back and she wrapped her legs around his hips. He rubbed the bulge in his pants against her like he was already deep inside her. My sister was being overwhelmed by the speed and force with which he was grinding against her and she suddenly exploded in tremendous waves of pleasure. "Oh oh oh, oh God... I'm... ooooh... I'm coming!" she cried in his ear. Her hips and ass thrust about wildly as he pressed into her with all his energy. After a few seconds, the heat was flushed out of her system and she collapsed for a few minutes. He slid off of her and lay his head on her breasts, gently suckling like he had been before he became so aggressive. My sister ran her fingers softly through his unruly brown hair. He turned from her bosoms to look into her eyes. He smiled back and kissed her softly on the lips. He moved down and softly nuzzled her breasts before continuing his downward journey. His mouth slipped past her navel and began to kiss the top part of her soft, brown, pubic triangle. She spread her legs slowly as his mouth moved down completely over her wet mound of Venus. The tip of his tongue slid down partway into the cleft of her labia at the top. She shuddered as it darted around her clitoris. He wrapped his arms under and then over her thighs, which helped her hold her legs apart. He slid his tongue down all the way to her inner labia, sliding it gently into her vagina. His lips came to press fully against her genitals, his tongue at least two inches inside of her. My sister was rolling her hips and ass as well as arching her back and head, as she moaned his name softly.