I guessed he was taking them from the laundry because I had a couple of difficult conversations with my mum when she found them covered, unmistakably, in fresh sperm. It led to one of those "Well, if you MUST, be careful" conversations. But I knew it wasn't me. So I started to figure out a way I could find out what was happening. I had worked out a very clever plan of leaving a camera in the bathroom, hidden of course, but as events turned out, I didn't need it.
I had come home from the shops and was alone, or so I thought as my kid brother should have been at school. I had kicked my shoes off and had gone upstairs when I heard a couple of little sighs. I stopped in my tracks and held my breath and listened. I heard a sentence, almost whispered in a high "girly" voice. "Oh, Claire, you look so lovely." I edged closer to the sound, which was coming from my bedroom! I heard more. "Ohh Jessica, you mustn't touch me there. It would make us lesbians." I peeked around my door and my brother was dressed in my trainer bra, and the knickers I wore in bed last night. As I watched he ran his finger along the crotch and put it to his nose. "Ohh Jessica, you've made me sooo wet." At the same time, his cock was sticking out of the top of my knickers and he was jacking himself. My little brother was pretending he was a girl and having a lesbian fantasy about me! At first I had thought he was just using my knickers to smell a girls pussy, but this was something far more intimate, and, I have to say, it aroused me instantly. I watched for only a few more seconds, listening to him pretend I was seducing my best friend. (Also called Claire) then I decided to act. I quickly slipped out of my top and skirt and took my bra off. I walked into the room. He stopped dead in his tracks of course, which gave me the chance to take over.
I walked to him and knelt in front of him. "Ohh Claire, I have wanted to touch you for so long." I said in my best sexiest voice and I ran my fingers over the knickers he was wearing. I looked up and smiled. "You dirty bitch, your wet!". At that point I buried my face in his crotch and licked the material. Then I stood and faced him. I took his hand and put it on my breast. "Touch me, Claire. I want to make you cum in your knickers" At that, I reached for his cock and pressed it down into the knickers he was wearing and started to jack him. "Ohhh Claire, I want you to do it for me. I want you to cum ino your knickers for me."
He murmered "Ohhhh Jessica" just once before I felt him start to pulse and my hand and the knickers he was wearing became soaked with his cum.
When he finished, I took his hand and asked him to do the same for me. Except I made him lie on the bed and kind of 69'ned him. He had his fingers in my knickers and I could smell a mixture of his cum and my pussy which sent me over nicely.
Afterwards, we talked about it. I would have been really angry if he had just been using my knickers to smell and stuff, but this was something more. He told me he likes being a "girl" but he could never tell the guys at school or even our parents. It may just be a phase, but from time to time, I dress him up in my things. I did tell my best freind Claire, about what he was doing. She doesn't know I would happily sleep with her, but she did say I could take her knickers to him. So on two ocassions now, I have had the sexy time of being my brother's lesbian lover AND I got to smell Claire.
Only thing is, I really want to smell her for real now!