My (28m) sister (20f) caught me jerking off while sniffing her panties. Some backstory, me and my sister grew up very close. Some might say closer than normal, she was always right behind me wherever I went and whatever I did. We slept in the same bed because she was scared to sleep alone until she was in hs. The other night while watching a movie in bed my sister came in and climbed next to me which her head on my chest and leg over mine telling me about her day as I stroked her hair. She was wearing boy shorts and a sports bra so there was a lot of skin contact. Things got awkward when a sex scene popped up as I could she started to get excited because her crotch became warm as I could feel it on my leg. This made me horny with my intrusive thoughts screaming in my head. I instantly became hard and tried to hide it but at that point she was pretending to be sleep and yawned moving her head onto my stomach face to face with my erection. I didn’t say anything in hopes she didn’t think I was weird but I could feel her breathing getting heavier. At this point the tip was poking out from my boxers and I could tell if she was awake she would have seen it and I so badly just wanted to push her head down and shove my dick into her mouth. And just as I was about to our mother called us for dinner which made her flinch a little so I shifted and shook her pretending to wake her. The next while she was out I went into her room and found a pair of panties she was wearing the day before and went back to my room. As I was jerking off I heard her coming up the stairs but ignored it and from the corner of my eye I could see she was peeking through my door watching me. I half expected her to freak out and started yelling at me but she stood there in silence watching so I decided to moan her name to see how she would react. I’m guessing it shocked her and she must have flinched cause I heard my door creak which must have spooked her thinking I knew she was there and left but I just finished and left my room as nothing happened. She was in the kitchen clearly flustered as her face was a bright red and she looked as if she finished working out and not looking me in the eyes which is something we always do. I smiled and simply said nothing and ruffled her hair and walked back upstairs. Maybe next time I’ll see if it can go further.

UPDATE: soooooo i took advice from a comment and I did a thing and I’m not sure if it’s progress or not but I think it is 😅the thing

UPDATE 2: ok you heathens here you go. So after my sister returned. I of course was in my room having a panic attack. I heard the front door close and heard her coming up the stairs, sweating balls with my heart about to jump out of my chest I threw my headphones in and pretended like I wasn’t having a meltdown. She came in my room and spun me around which I had to act fake surprised cause headphones on, gotta sell the act ya know. She looked me dead in my face, which was hard for me to do in return and said “you didn’t send that by mistake did you”. At that point my mind was racing a million miles per second and in the end after stuttering and biting my tongue she said “I knew it”. I looked at her pretending to be confused which made her confused as she told me how she caught me masturbating the day before while smelling her underwear. At this point I felt like I was looking up at a giant brick wall not sure what she would say next but surprisingly she became super bashful and looked away. I took this moment to tug on her shorts pulling her closet wrapping my arms around her legs and burying my face into her stomach. She wrapped her arms around my head and said “you could have just asked me for them and I would have given them to you”. INSTANT BONER. But I controlled myself which was hard to do as she started stroking my hair I just stayed quiet breathing in her scent as she said “maybe next time I could help you” hiding my excitement I backed up asking what she meant. Looking at her face that turned BEAT RED I tried to hold back a laugh as she punched my shoulder which did hurt and ran out the room. Later last night we made plans to watch a movie in her room “avatar way of the water” … I will update you guys soon. Here’s my sisters body shape photo don’t ask to see her face cause I won’t show you 🤷🏾.