Sister Watched Me

Growing up in my teen years I lived with my Mom and my sister. As my mom worked and went out my sister and I were home alone together. She was a year younger, 14 at the time. It was a nice house that had a Jacuzzi tub / spa in the master bathroom. My sister and I didn't have a pool, so I suppose this was the next best thing. One day while my mom was out in the summer we were bored and decided to jump in the spa together. We had our bathing suits on (and no touching what so ever was going on, nor would it ever). It was a pretty large tub so we both fit without feeling uncomfortable. The warm jets felt nice and we just started talking.

We both admitted that when no one was looking and we were alone in the spa tub the jets felt really good on our private parts. After talking about how good it felt we were both like hey why not try it now? We both agreed and gave each other permission to put our privates up against the jets. Keeping our suits on of course as to not feel too uncomfortable. At this point I already knew I was an exhibitionist, so the thought of giving myself pleasure with my sister in the tub was a real turn on. We didn't say much at this point and proceeded to get some respective pleasure from the jets. I think I was already hard pretty much as soon as we got in the warm water. The jets felt so good, even over my suit. I pulled down my bathing suit a bit and let jet hit the tip of my hard cock. After a bit my sister said she was going to get out. I said okay and stayed in for a bit. She left, and I remove my suit, completely naked in the spa letting the jet hit my throbbing penis. She had left the door open too, and I didn't even care at this point.

I couldn't take much more, but for some reason I didn't want to cum just yet. I had a sneaking suspicion that my sister was curious about my masturbation. I already had a fetish of being watched and even the thought of masturbating openly turned me on. So, I drained the water from the tub, got out,  and got some suntan oil from the cabinet. I sat on the toilet and began stroking my cock with the bathroom door still open. To my surprise my sister came back and stood in the doorway! She asked what I was doing and if I was "done" and if I was "okay". I said "not much"  and "i'm good" and just proceeded to stroke my cock right in front of her. She came back a couple of more times and watched me! Now I was really horny and turned on.

Throwing caution to the wind (I mean she's already seen me fully naked and stroking) I just started walking around our upstairs completely naked and stroking. She was in her room and I was standing in the hallway and in her doorway naked and stroking away. She asked me questions like "what does it feel like?" and "why do you do that?". I just kept stroking telling her it feels really good. And boy did it ever!

Then I told her I wanted to show her something more. I already had a habit of going on our back deck naked and stroking. It was fairly private, and the hot sun would beat on the deck. I had her follow me downstairs as I proceeded to walk out on the deck in the full sun, completely naked and stroking. She gasped and said "Someone will see you!". I said nah its pretty private.

Then she went upstairs and I followed her, still naked and stroking. She got a little annoyed that this was still going on. I asked if she masturbated and she said yes sometimes. She then asked again why I did this, and this time I said I will show you. I had her come out of her room into the hallway where the stairs were. I sat on the top stair, feet on the stairs and my back on the floor to the hallway. I spread my legs a bit and was feeling so horny and exposed. It was feeling really good and I stared cumming right in front of her, shooting ropes of cum in the air while moaning. She said "gross" and walked back to her room and we never talked about this experience (nor, thankfully, did she tell mom or anyone else to my knowledge).

I still get horny thinking about this experience... She would catch me many other times, but none like this one.