Getting Horder by the day

I've been flashing Chris on and off for a few days now, and I can see from the reaction in his pants that he doesn't mind. Sometimes,I wear just tights, no,panties, other times panties, no tights, once, no anything! Yesterday, we were alone in the house just chilling, Jayne is on airport standby which means she has to go to,work and be there just in case another pilot calls in sick. I had the same panties on I'd worn in bed last night. They were dark blue and of a bikini style. I made sure that as we loafed around in the lounge, that Chris got several eyefulls. Then I announced I was gonna go to get dressed. I went to the bathroom, but did so quickly, because I didn't want him jacking in his room. I made sure to leave my panties balled up on the floor. Then I went to my room and waited. chris went straight into the bathroom after me and it went very quiet.  He was in there for about 20 minutes, but I didn't hear any water running, or the toilet flush! When he left, I retrieved my camera. Here's what I saw. He had gone in, stripped naked, and sat on the toilet. He had a huge erection which he started to wank very slowly. I could see him looking around and I was willing him to find my panties. After a few minutes where he seemed to be teasing himself, wanking then stopping, he picked up my panties. He held them, stroking his cock gently and then smelled them. I tell you, I was flooding my own panties watching that. For about five minutes alternated wanking with smelling and now and then licking my panties.  Then, he put them on! He cock poked out the top, but he started to rub them down where my clit would be. His other hand went to his nipple, and I realised he was masturbating as if he was a girl. Now and then his cock would strain a little and I saw the tip glistening like it was getting wet. But his main attention was lower, I guess between his balls. Then he arched his back. His nipple hand reached down and pulled the waistband away from him, while his arched back meant that the jets of spunk went almost straight up in the air, but fell down into my panties! The first spurt was very big and seemed to jet quite a way in the air. I didn't know boys could cum without touching their cock, but it seems they can. I also didn't know that boys sometimes get off pretending to be girls. I left it a while before scuttling back into the bathroom. My panties were in the hamper but they were full of sperm. Most had gone on the inside of the front but there was some right in the crotch too. I took them back to my room. This is my first time with sperm. It smelled, hmm...I don't know....it's difficult to,put a word to it, but I would say slightly metallic. And it tasted salty. But all I knew is that I was desperate for a cum, so I put them on, getting sperm all,over my cunt at the same time, and lay on my back on my bed. I am not ashamed to admit I was thinking of my brother the whole time, but my fantasy was around drawing him up properly, putting him in a pair of my panties, a bra, a top and a nice short skirt and then having sex with him. One thing though, when I got about to cum, it was as if the scent of the sperm got really strong, then I remembered it was there and I had real sperm between my legs. The cum was fucking amazing. I decided to keep the panties on for a few hours too. Now, for those worrying, I've been on the pill since I was 14 because I have periods from hell, so there's no danger of getting more from his sperm than a thrill.  Now, sometimes, Chris and I wrestle. We are about the same build, and I know Jayne has playwrestled with him too. It won't be too difficult to pick a time when he doesn't have much on, and I can make sure I've got no underwear on. You can guess what I have in mind.