My brother, Billy, is 2 years younger than me. As I developed into a woman, there were a couple of times where I caught him staring, his hormones obviously raging, even when looking at his own sister. Sometimes I'd purposely tease him by bending over in front of him while wearing a loose fitting shirt so he'd get a look at my often bra-less tits. He'd frequently be sporting an erection, as many young men do and since he favored sweatpants and gym shorts, it was pretty obvious when he was aroused.
One summer day when I was 20, and he was 18, I had gone out shopping. Since it was so warm, I had put on a light sun dress. It was yellow with flower patterns on it. Not wanting to feel restrained or to sweat too much, I skipped the bra and put on a scant, thin thong to ensure maximum coolness. Should the sun hit this dress at the right angle, the viewer would not need to use their imagination to know what lays underneath and I was ok with that. I'm quite the voyeur.
I wasn't successful in finding everything that I was looking for when I went shopping, so my trip was a bit shorter than I had expected. I got home and noticed my parents cars were gone but Billy's car was there. Hmm... wearing this sundress with no bra and a thong, I could probably really tease him, especially without my parents being around.
As I walked into the living room, I looked down the hall and noticed my door was open. I normally close my door before I leave, so I walked down the hall and as I got there, I could see Billy in my room. Stopping just before the door, I couldn't believe what he was doing! He was laying on my bed wearing nothing but a pair of my panties with his hand down the front, stroking his cock! Billy is a small guy so these panties fit him well.
