I like wearing my sisters underwear when I masturbate, I'm a male 22, my sister is 20... It was last week that I went into her room to get one of her thongs when I found her vibrator in her underwear drawer, I'd never seen it there before so I took it and one of her thongs into my room and undressed and put her thong on... I was about to start rubbing the vibrator over my dick but it didn't work, I opened it up from the bottom to check the batteries and a note fell out. It said "I know you like going through my underwear drawer, can you do me a favour and buy some batteries" I was shocked that she knew. I got the batteries out of my tv remote and put them in the vibrator, I turned it on and started rubbing the tip of my dick with it while stroking it, I came very quickly. I cleaned myself up and decided to keep the vibrator in my room. My sis came home that weekend and when my parents were out she asked me where her vibrator was with a shy smile, I told her it was in my closet in my room. I left a note with it saying I would love to watch her use it. She went into my room and a few minutes later she called me, I went upstairs and saw her lying naked in my bed fucking herself with it, she asked my if I liked what I saw, it felt weird but it was such a turn on. I dropped my jeans to my ankles and starting wanking my hard dick while watching her. She orgasmed when she saw me stroking my dick up and down. She got up and gave me a kiss on the cheek and said thanks for the batteries... Then she sat on the end of my bed and watched me make myself cum. I grabbed her underwear and came into them, she smiled and said give them back when you've finished with them She left the room and I got into bed and continued stroking my cock with the memory she just gave me... I don't want to fuck my sis but I'm going to continue masturbating with her. Its a the biggest turn on ever