Touching pussy of my sister

My name is adil and i live in india. I have a sister namely samina. I am 16 and she is 18. She is very pretty. I have mysterious feelings for her. I feel sexually attracted to her.
When so ever she goes to bathroom i check her and see her pussy. We have a common bathroom. I see her bathing and unfortunately only her ass is visible. She has brown and sexy skin.
I always wanted to fuck her. But i always stopped because this is sin.
One day she was sleeping and i was horny. I opened the door of her room and found her sleeping. It was summer and day, she was wearing a tight shalwar and her panty was somewhat visible. I thought it to be an occasion. I slept besides her and kept on dragging myself close to her. I now decided to touch her ass but could not. Finally i dared to touch her ass. She was in a deep slumber. I started moving my hand over her ass and i was very horny now. I slowly put my finger in between her legs and started touching her pussy softly. She started moving and i removed my hand. I pretended to be asleep. She then woke up and slapped me. She said how cheap i was that i touched her pussy. She now said that she will inform parents about it. I couldn't say anything and i left. I went to bathroom, took her panty and jerked on it.
Fortunately she didn't tell anyone. After 3 days i was watching a porn movie and she suddenly entered a room. I closed my phone and she insisted me to open it. I opened my phone and she found a sibling porn movie there. She had never watched porn before and asked me what was it. I said it is porn . She sat besides me started watching it. After sometime she started touching her pussy and moving. I thought it to be an occasion and started helping her. I asked her to undress herself. She said that she had never done so before. At first she resisted and finally she was motivated. She first closed windows and doors and started taking off her clothes. She said i am virgin till now and how bad is it that i am about to be fucked by my brother. I was also a virgin and i assured her it to be a secret all the time. She was in purple braw and panty when she took my clothes off. My 8 inch dick was very hard now. I kissed her lips and started sucking her tongue. I took my hands in her ass and pressed it. We kissed for a long time. Now I took off her braw and her boobs were very nice and big. I started pressing her boobs and she enjoyed it. Now I removed her panty and her pussy bony pussy was shaved. I inserted my finger in her vagina and she started moaning like aahhhhh ahhhh mmmmm . Now i took my dick into her mouth and she started sucking it. Then she asked me to lick her pussy. I then kissed her pussy and started sucking it. She started moaning like aahhhhh fuck me fuckfuck me . Then i laid her on a bed and opened her legs. I tried to insert my dick into her extremely tight pussy. It couldn't get in . Then i slowly put my dick on her cunt and rubbed. Then she started moaning and saying fuck me come on fuck me hard. I then kissed her and quickly pushed my dick into her pussy. She cried tears fell down from her eyes and i continuously fucked her. She asked me to stop but i didn't. Fucked her tight pussy and enjoyed her cries .after sometime she started also enjoying it and asked me to fuck hard.
Then i turned her into a doggy style and fucked her relentlessly. It was very nice fuck. I was fucking my sister and it was best. I fucked her pussy for an hour when i was about to cum i asked her where to cum. She told me to cum inside her pussy and i cummed inside her pussy.
Then after she got up started eating cum. Cleaned her pussy and said me it was awesome. Then after I fucked her whenever we were free.