My sister used to masturbate in our bathroom when I was using it to take a shower.

I (16M) showered at night while my sister (17F) showered in the morning. We have a shared bathroom in our room. She wanted our parents to add an extra bathroom so she could have a bathroom just for herself but our parents told her that they couldn't afford it.<br><br>We were showering at the same time for a while but she was complaining that the shower was mostly cold because of the low water pressure so we went back to our old showering habits. We had a shower caddy between us for us to hold our showering products. One night I found a vibrator out of the shower caddy on the floor. I picked it up and I saw it was still buzzing. She came into the bathroom and saw me holding it and she wanted it back so badly but I held it away from her and was teasing her with it. She said that it was hers but I told her that I found it on the floor and I didn't know that it belonged to her. I asked her when and how she lost it and she said she lost it when she was masturbating in the bathroom when I was in the shower. I asked her to prove to me that it was hers and she said she would do anything to get it back so I gave her the options of either blowing me or letting me touch her for the vibrator but she immediately said no. She said that I was disgusting and that I had no right to keep it from her when she lost it. I told her that I wasn't the one who lost it in the first place. She looked so mad that she started crying so I decided to tease her a bit more and I turned it off and on and pretended to use it and she was begging me not to break it. I gave it back to her in the end but she hasn't talked to me since.