Underpants

I had to go and stay for a week at my Aunt's house when my parents went away on a business trip. Her son, my cousin was only a year older than me but in early teens that is a lot and he didn't really want to have much to do with me. He was always out and about with his mates but that didn't bother me as I was in training for for a big swimming competition the next term and was also studying for exams. So I spent the mornings at the local pool and the afternoons working. One day I arrived at the pool to find it closed, problems with the pumps or something. I decided to go back to the house and do some studying. When I got back I noticed my cousin's bike propped up by the front door, which was odd because he was usually out most of the day. The door was locked which was also odd. Perhaps he'd gone out without his bike. I knew where the spare key was hidden so I unlocked and went in. The hall was thickly carpeted so I made no sound as I walked down towards my bedroom. I passed the slightly ajar bathroom door and suddenly realised there was someone in there. I almost called out but then quietly crept back to see who it was. My cousin was standing with his back to me wearing nothing but a pair of white briefs. His right arm was moving rhythmically and it was clear he was wanking. I watched for a little while then, with a shock, took in the rest of the scene. The laundry basket lid was open and he had draped a pair of my underpants over the towel rail. He was staring at them and jerking his stiff prick with another pair. Every few seconds he would thrust his hips forward and rub his prick against the pants on the rail. As he did so the cotton fabric of his briefs rippled against his buttocks in a way that made my own prick stand urgently to attention. He began wanking faster and looked like he was close to cumming. I really wanted to watch but even more didn't want to get caught so I crept away and went round the side of the house. I was considering taking care of my aching cock in the bushes when the front door opened, my cousin came out and rode away. I went back inside straight to the bathroom and opened the laundry basket. There were my used underpants, I took them out and spread them out, revealing a big wet patch staining the light blue cotton. Two can play at this game I thought, and rummaging around soon found a pair of his white briefs. I wrapped them round my prick and started to wank. The feel of the soft cotton against my hardness felt fantastic and I soon had to slow down to prolong the experience. I found another pair and put them on, pulling my prick out of one leg hole. The sensations became too much to bear and pretty soon I shot a huge load into his briefs. I did it again whenever I was alone in the house and I knew he did too because I checked the laundry basket. I don't know if my Aunt ever notice the cum stains, but she didn't say anything. On my last day my Aunt was due to take me to the station at noon but had to take my cousin somewhere first. I only had about half an hour but I had it all planned. I went to his bedroom and soon found his underpants drawer. There was quite a stack, mostly white briefs but some colours too. I picked a pair of white y fronts, stripped off and putting them on started to wank my already rock hard cock through the cotton fabric. The seams of the fly got in the way though until I had the idea of putting them on back to front. Much better, now there was just the thin, soft cotton and that familiar almost unbearable sensation. No time to waste though so I rubbed hard, came hard then took the wet, sticky pants off, folded them and replaced them in his drawer, a couple of pairs down so he wouldn't find them for a day or two. I chose a few pairs to take with me in my suitcase and with just a few minutes to spare was ready downstairs when my Aunt came back. During the train journey home I kept thinking about the briefs in my case, fantasising about what I would do with them, getting uncomfortably hard. If the toilet hadn't been out of order I'd have gone in there and relieved the pressure but I had to wait till I got home. That was the start of my love of men's underpants and I still use them to wank to this day.