Two years back, I Raj 21 yrs, in my family mom 46 dad 49 and elder sis 24 yrs. We are very open minded family, all are like friends. We share every thoughts two each other and occasionally we take drink together. I and elder Sis (Tanya) were very good friend. We go everywhere together in movie, party and disco even our friends were very common. She has a boy friend and her friend was my girl friend. We four always go for movie together and even movie we kiss and do body sex in front of each other nothing to hide. Didi was very sexy that’s why she loves very much body contact of her boy friend and always says to me that its natural and life is for enjoy so enjoy baby with ur girl friend. One day we was invitee in our common friend’s birthday party at there we all four was there. We take drink and smoke too much and after party when we are coming back didi and her bf (Asis) was in back seat and me and my gf (Ria) in front, at back seat they were making fun too much, they kissing each other and some times asis pressing boobs of didi(Tanya) and she also enjoying and cooperate to do so. I and my gf watching through looking glass. After reaching home didi just smile and say that’s the life baby enjoy. Then I say also to her openly that what do u think only u enjoy at back seat I also enjoy in driver seat which is u cant see. Then she ask how is it possible u was driving then I smile and say Ria was not driving she hold my gear and rubbing and give me a good pleasure then she smile and say keep it up nice sexy Ria also.After that event we are very open to each other regarding sex topic. many times we go to movie and kiss each other partner openly. on 31st night we 4 go to a pub for celebrating 31st night we enjoying lot of fun at pub by taking smoke, hukka and drink. stepping on beats some sexy steps after that we return to basement garage of that pub to take our car seeing that one cpl enjoying sex in there car and security person take 500/- to do them so. then i have idea lets do full enjoyment minimum 30mins there in our scorpio car. Didi and her BF agreed, we paid that amount, didi go to back seats with her BF and I with Ria in middle seat. we hug each other partner, smooching, kissing deep every thing was going on then Ria show me that my didi was toples and i see her boobs were open and sucked by her BF then we also do the same thing. Ria hold my dick and put it out from zip and start giving me a good blow job seeing it didi said wow what a sex u r Ria, making real fun in open place gr8. then suddenly security came there and we cover ourselves and they force us to leave that place. So we leave and coming back to our house at 3.30 am. Then didi say what a nice party and night we enjoyed then i say but it should 15 mins more require because i was in heaven at that time just blow was required. Didi smile and say o my poor bro i can understand what else u require at that time.saying it she hug me in her arm and whisper in my my ear that u came in my bedroom. after changing my dress go to her room at there she was only in a hot pant and bra. seeing me she hug me and kiss me and say i just help u to come out from that little error which u cant make so dont take it otherwise. i said u can confident on me. i also kiss her deeply and start smooching her boobs. now she hold my dick and start masturbating for me. I was realy in heaven at that time.after 10mins i blow to her hand and kiss her hard and say thanks didi and happy new year.