Grooming my sister and BIL Part 1

I spent 4 years grooming my older half sister to let me fuck her husband, From the age of 14 I had an unhealthy infatuation with my BIL, He watched me grow from a tall, Skinny, Gangly, Flat chested girl into a tall, Slim woman with DDD's. At 14 I couldn't get a boy to look my way no matter how hard I tried, I was tall, skinny, Flat chested and had no ass and when my BIL walked into the room for the first time I think I got wet, I was instantly infatuated with him, I would do anything to try and let him see me topless which wasn't a lot but maybe happened 3-4 times.
At 15 I started to bud and had big, Ugly puffy nips, I walked right into a room he was in one day and he stopped, Froze and stared at them, My sister was 15 years older than me and he was 17 years older, By the time I was 15 they already had 2 kids and one day we went to a public pool. My sister, BIL and the kids headed to a family changeroom and I was going to go to the girls changeroom but stopped and looked at my sister, She said "What?", I said "Do I have to go in there alone?", We talked for a minute and she said "Well...**** is in this one", I scoffed and said "Oh I don't care, He's my BIL", My sister thought for a minute then allowed me in to change with them, The entire time I fumbled around trying to let him catch a peek at me but he kept his back to me, It wasn't until we were leaving and went in to change that I got to see something, He had his back to me, Pulled his trunks down as I pretended not to be looking but as he bent over I got to see his dick, Even after just getting out of the pool it was huge and swayed from side to side as he toweled off and then got dressed, I think he got to see my boobs for a second but acted like he didn't care.
My sister and I didn't grow up together due to the difference in age and she always seemed more like a mother to me than our own mom, When I was 15-16 I started to blossom physically and I had basically moved into the spare room at my sisters, I spent every spare minute there and my entire wardrobe around the house was flimsy, See through tops and short shorts or jumpers that hid very little, I was constantly sitting in a manner that allowed my BIL a chance to peek up the leg of my jumpers or see down my shirt or right through them, I did everything I could to make my sister comfortable with me being damned near nude in front of them and there were times that even I was like (Oh man, I am really pushing the envelope here).
My sister and I are about as opposite physically as could be, She is short and small chested with an absolutely perfect booty, I am tall and skinny with no ass but DDD's, My sister and BIL really started to take over the parenting role when I was 15 and I pretty much lived there, I talked to my sister a lot about sex and so on and when I was 15 I told her I wanted to keep my V card until I was 18 so I talked her into taking me dildo shopping and she bought me 3 different toys, One afternoon when I was 16 I was hanging out with my BIL and was sitting across from him letting him look up my jumper at my bald little vag, I told him the same thing and he said "Oh ok, I think that's a good idea", I told him my sister had bought me dildos to help me take care of my urges but that I wanted something I wasn't comfortable asking my sister for, He got a bit nervous and I asked if he would take me to get something, He was very nervous but finally I convinced him, My sister was out of town and we drove to a place all the way across the city so no one would know us, I told him I wanted to go in and being tall we figured they wouldn't question me, We walked in and a woman came up, Asked what we were looking for so I told her "Fuzzy cuffs and nipple clamps", Lol, I think My BIL almost blew a load right there.
So there I am sitting in my room looking at my newly aquired toys wondering how I could best put them to use, My BIL had gone out with some friends and I sat waiting for him to come home, I seen him pull into the driveway and bolted for my room, I quickly got myself set up and waited, I was sitting there waiting and finally heard him in the kitchen, I had my door open just a crack and called out to him, I said "**** is that you?", He called back, "Ya it is", I said "Uuuhhh...I fucked up", He asked what was wrong and I could hear that he was outside my door, I said "Don't come in", He said "Oh, Ok", I said "I need some help but...I'm naked", He was quiet for a minute then said "How can I help?", I asked "Have you seen me naked?", He was quiet for a second then said "Well...I have seen some stuff, I mean...We live together so things are bound to be seen" I was pretending to sob and he asked if I was ok, I said "Do you promise not to judge me?", He said "Uuuhhh...Yeah, Sure". My heart was racing as I said "Ok...Come in".
It must have been quite a sight for him, I was sitting on my knees, Knees and feet spread wide, I had a dildo in me and was sitting low enough so it wouldn't slide out, I had my hands cuffed behind my back, and my nippie clamps on, I had my suction cup dildo stuck to my table in front of me and mascarra running down my face.
I looked at him as he entered and then he looked away and said "Geezus christ ********", I said "I dropped my key", It was on the floor behind me and I watched him in the mirror as I leaned forward as far as I could putting my head on the floor, My dildo popped out and he bit his lip as he looked right at my vag and butt hole, He uncuffed me and I sat there looking up at him, I said "I am so sorry", he said "What the hell?", I said "Sorry...I was gagging myself and dropped my key", He coughed and cleared his throat saying "Ok, Ok...I don't....Ya, Ok". He had a raging boner and I could see it through his jeans as he said "I....Am going to go now" and left the room, I pretended to be shy around him for the next little while but wasn't.
about two weeks before I turned 17 me and him were alone and I went to my room, Left the door open a little as I often do and undressed, Got into bed and waited, I could always hear his footsteps when he would be going to bed and I knew he was on his way so I flipped onto my hands and knees, Folded my pillow in half and shoved it under me and started humping it, I always had everything set up and I had my little table mirror in just the right place so I could see him, He walked past, Stopped, looked in and then watched me, I was surprised at how good pillow humping works and I came hard, I had to leave my pillow on the floor that night because it was so wet.
The next day I decided to go for it, I was going to ask my BIL to fuck me while my sister was at work, I heard her leave and hid in my room knowing he would be home and I waited until I heard the shower running, I went to their bathroom which has a pocket door so I slid it open and peeked in, He was in the shower lathering up his body, I sat on the foot locker and had my top around my waist, My thong around my ankles and was rubbing myself, I heard the shower stop and my heart started to race, I peeked until he reached for the door then leaned my head back on the bed, The door slid open and he said "Oh fuck...I'm sorry...I mean...Oh fuck". I panicked and looked up at him, I said "Oh god, I am so sorry, I didn't hear the shower stop, I am so sorry", He said "What are you doing in here?", I looked up at him with puppy dog eyes and said "I am so sorry, I masturbating watching you in the shower", He cleared his throat and said "Geezus, I...I don't know what...I...", I started blathering about how infatuated I am with him and how huge his dick is and the whole time I sat there with my thong around my ankles and my boobs out, He finally stopped me and said "Hey, Hey, Hey...We can't be talking like this", I said "Please, Just once, Be my first", I literally begged him, I got on my knees and begged him, He took my hands and stood me up, He looked me in the eyes and said "Look, I can't, I am married to your sister...Like for real it would ruin our family and ruin your relationship with her".
After a bit I nodded my head sobbing and found I was actually crying, Like real tears, I was about to walk out of the room then turned around and said "Ok, If you don't want to can I just see it, I just want to see a real one", He took my hand and sat me on the bed and said "Look, I will make you a deal, This...This whole thing never happened but...If you...Can convince your sister...To do whatever...I will do it". I was in shock, He wanted me to approach my sister, I was like "What???", He said "We never had this conversation but...If you want this...You have to put in the work" and he opened his towel, His huge dick was standing right up, Massive, Thick, Long, curcumsized, Gorgeous. I reached out for it and he slapped my hand, I squealed a little and looked up at him, He put his hand under my chin and said "Do you want to be mine?", I nodded and he knelt down, He was eye level with me and said "If you want to be mine you have to do the work, You have to do what you're told and you have to be a good girl", I said "I can be...I will be...I'll do anything".
So that spawned a year and a half mission for me to have sex with him. See part 2

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