I was teasing my sister’s boyfriend [F]

It was 10 years ago, when I was still a teenager (18). My older Sister used to date a guy (lets call him Will) who was in his late 20s. Very handsome, tattooed, kind but I knew he would never look at me, and always treated me like a wee sister.
I had fantasies about him, but would never want to hurt my sister, so all I could do was to have dirty mind about him. I was teasing William couple times with not wearing a bra under my shirt or accidently touching him while passing by and weeks later Ive noticed he was looking at me differently, like he was looking at the sexiest woman alive.
Ive decided to move a bit further with my teasing and one day while I was wearing a skirt, I didnt have anything under it. When he came to pick up my sister for a date, I was eating dinner and dropped my fork by purpose so I could go under the table, „accidently” showing him my bare ass. I knew he seen it. Later that night when my sister came back from her date, she told me that William was weirdly horny from the begining and even asked her to do a quick bj in his car, before they even left the parking spot to go for a date. From that moment I knew he was thinking about me…
2 weeks later, he visited my sister, but they had couple glasses of wine while watching tv so they decided that William will sleep that night at our house, as he couldnt drive.
Later that night I went to take a long bath, but first time in my life I didnt lock the door, hoping he will enter the bathroom by accident, but he didnt. I was there for so long and it was very dissapointing that he didnt have a chance to peak at my body.
I putted on my sexy panties and most visible through pj I had and joined them watching the tv, however non of them even looked at me.
Some time after midnight I went to bed. Around 20 minutes later they both came in. Problem in our small house was that me and my sister were sharing a room so it was even more frustrating having William there who didnt pay any attention to me that night!
They both thought I was sleeping, while I was pretending to, as sleeping in one room with him was akward and I wanted them to feel free, thinking Im not watching. In fact I really wanted them to watch having sex! When they were in bed, they were kissing and William was trying to convince my sister to have sex, but she was refusing and she clearly said it was because I was in the same room and with all that noise, they would simply wake me up. William was not happy, but tried one last time, this time asking for a BJ. She agreed! He took his boxers down showing off his cock and my sister took her top off and started to suck his dick like a pro. I was on the side, peeking on them and after a minute I noticed it… He was looking at me while she was sucking his dick! When he seen my scared face, William just smiled and continued to enjoying the moment. I was in shock but I was happy at the same time that he didnt cause any scene or embarassed me but allowed me to watch how good my sister is. I decided to go step further and lyed on my back to put one hand under my panties and with other I took my boob out. I did it by purpose so he could watch it while receiving the bj. I was playing with myself, trying to be as quiet as possible, while keep peeking at William who was enjoying BJ from my sister. It was one of the scariest but also the most sexy moment I ever experienced. It felt like a threesome even if I didnt take part in it.
After couple minutes I finished, trying to be as quiet as possible and when William noticed my satisfied face, he decided to let it go too like he was waiting for me and cum in my sister’s mouth. She swallowed all of it and at one moment ive seen his pulsing satisfied dick and imagined he just came for me.

For half hour I was pretending I was sleeping, waiting for them to fall asleep as I needed to change my wet panties. Once Ive heard my sister snoring, I woke up from bed and went to the shelf next to their bed. I tried not to look at William, but I could feel his eyes on me. I decided to give him one more tease and took my wet panties down and while standing, I was looking to the bottom drawer allowing him to see my full ass and pussy.
When I changed and came back from the bathroom, I met william at room’s door. He was going to the bathroom now and while I was entering the room, I touched my boobs in pj over his chest while passing by. There was sexual tension but both of us just smiled and did nothing else.
When he came back to the room couple minutes later, I was kind of hoping he will go to my bed, but instead he just went to cuddle my sister.
I was satisfied anyway, I came that night while watching this very erotic scene and Im sure he came while thinking about me. Ive never told anyone about it and never spoke with William about that night. My confession here is admitting to be a bad girl since teenage years.😋

Did I finally fucked William? Thats a story for another time…

Source: reddit.com/r/gonewildstories/comments/10uvppm/i_was_teasing_my_sisters_boyfriend_f