it happened when i was only 15 years old. most nights i sleep naked because it gets hot in out house and i was not allowed to touch the thermostat. but this was ok because we all had separate rooms with doors in our house and it was just me and my at the time 19 year old sister upstairs. i always keep my door closed and usually hear if anyone comes in. i must have been sleeping very hard, no pun intended for this next part, but i woke up to my sister sucking my dick. i begin to panic and ask her what the hell she is doing in my room and why is she sucking on my dick. she tells me to keep my voice down, she saw it when i was in the shower the other day and she wanted to know what it was like to suck her brothers cock. i tell her we cant do this she is my sister, but my erection was not going down because she was naked and she did have some really nice tits. she told me to lay back down and just enjoy. i hesitated but she pushed me down and went back to sucking. it felt so good, i have never had a blowjob and was also a virgin at the time so 2 minutes later i was about to cum and she could tell but kept sucking until i blew my load in her mouth. she swallowed every drop of it. she lays in my bed next to me kisses me and says wasnt that better than jerking off. i said yes, and the whole time she is playing with my balls and my dick and within a couple min im hard again. she said she wants to ride it this time, again im a virgin and ask her what does she mean and before i knew it she climbed on top of me and positioned my dick at the entrance to her vagina and then eased her way down. i was in ecstasy, i could not believe i was losing my virginity let alone to my SISTER!!!! she was grinding on me and it felt like nothing i had felt before. i maybe lasted 15 min but she told me she was on the pill and to cum inside her. i came harder than i ever had masturbating and was a little light headed. she lifted up off of me spilling some up my cum back on me. kissed me and said thank you and to never let our parents find out she did this. this is the first time im telling anybody about this and still cant believe my sister talked me into that. that was the only time for awhile that we did that. it didnt happen again until she was 21 and was drunk after a breakup. where she stumbled in and started crying and we sat in my room drinking together and when we were both drunk she reminded me of the last time and how nice it was and how she wishes guys were as nice as her little brother to her and she shoved me down and pulled my pants off and started sucking my dick. she sucked till i came and then we both cuddled up in my bed and went to sleep. i forgot to mention we both put on our sleep clothes so that if our parents walked in it wouldnt seem suspicious, just look like i was comforting my sister when she had her heart broken. this was the last sexual interaction me and my sister ever had. i feel wrong for letting her do that to me and i know it is technically r**e.