Watching Him

"Have a good time at soccer practice," I'd told my son as he kissed my on the cheek on his way out the door. It was Saturday morning, and I was on my way to get some laundry done while he was out of the house. I walked into his room and shook my head as I started picking up his clothes and putting them into the laundry basket. Having just turned 18, he should be picking up his own clothes and doing his own laundry, I thought to myself. I bent down to grab some socks that I saw poking out from underneath his bed when a something purple caught me eye. "Are those..." I said to myself as I reached under his bed and pulled out one of my favorite pairs of underwear--a purple lacy thong that I usually masturbate in while I'm standing in front of the full length mirror in the privacy of my own bedroom. As I was handling them and trying to figure out why they were under his bed, I felt a sticky wetness that was still slightly warm. I turned them over to see one of the largest deposits of what I assumed was semen that I've seen in a long, long time. Touching the wetness then smelling my fingers confirmed it. Yup, semen. I was so angry. I threw the violated pair of my underwear on top of the laundry basket and marched to the kitchen to get my phone. Slamming the laundry down on the counter and grabbing my phone, I was confronted with the problem of what exactly to say to my son. I was going to text him, but then didn't know how to start the line of questioning. I would just have to wait until he got home and have the conversation in person. So I started again with the laundry. I couldn't help but be a little flattered that he was using my underwear to masturbate. My friends tell me I'm attractive and look great for being forty, but good friends always say things like that. I started wondering what he looked like when he was doing it. Did he sniff them? I couldn't remember if I'd left them in my room used or if they were clean the last that I'd seen of them. The rest of the day dragged on. Sometime during the day I'd imagined him naked, thrusting his big erection into my underwear and after I couldn't erase the thought from my mind. Still alone at home, I went to the living room, pulled my pants to my ankles, sat on the sofa, and masturbated to a quick but powerful chain of orgasms. I licked my fingers thinking wondering if he licked my underwear. My son had texted me that he was going out with friends to play computer games after practice and wouldn't be home until late. He still wasn't home when I went to my bedroom to read before getting ready for bed. As I laid there reading, I heard him come home. He went straight from the door into the bathroom. I heard him start his pre-shower ritual and suddenly a thought popped into my mind. From the yard behind our house, you can see into the bathroom window. We don't have any neighbors who can see in, so I usually leave the shades drawn to let light in. At night, however, you can't see outside and it was night by now. I bet I can see him, I thought to myself. I quickly and as quietly as I could left the bedroom and stepped out our back door into the back yard, thankful that none of the doors made noise and I could make a quiet exit. I walked around to the point in our yard where I could see into the bathroom. I got to my vantage point just in time to watch him standing in front of the mirror with his shirt off, flexing and admiring his pecs and biceps. He was constantly working out and had built himself quite a physique. He messed with his hair a little, poked at some tiny zits on his face, then pulled bent over to begin pulling his pants off. My stomach leaped straight into my throat as his boxers came off and his fairly large, half-hard penis sprung from his shorts. He admired himself in the mirror again, standing there flexing, turning his back to the mirror and looking at his butt while he flexed it. Then he turned again back to the mirror and gave himself a few strokes while he eyed his penis as it became more engorged. By this time, my heart was beating one hundred miles an hour as I watched him turn on the water in the shower. I had never been more thankful that I didn't replace the clear glass shower door with a curtain--something I'd considered a million times while washing the soap scum off the shower door. He stepped into the shower and closed the door. As I watched him soap himself off, my heart's racing was joined by a throbbing between my legs. I absolutely ached to touch myself. It had been such a long time since I'd had a man inside me, and the penis I was looking at was much larger than his father's had been. He finished soaping himself then stood front mostly facing the door with with his feet shoulder-width apart. He was fully erect by now, and I watching in fascination as he started rubbing himself. He stood there with his eyes closed, slowly rubbing the entire length of his erection--from the base to his beautiful head. His abs started to flex slightly as he tilted his pelvis with each thrust. He picked up his pace, thrusting faster and faster. Before long, he was using both hands to rub his length. It seemed like an hour, but it was probably only minutes. He stopped thrusting and opened his eyes and looked down at his penis and started pumping with his right arm as fast as he could. I thought he was going to rip it off. After a minute or so, a large stream of semen erupted to made a mess all over the shower door. He kept going until only a small dribble oozed out, then he wiped his surprisingly large ejaculation off the shower door (I was grateful for that) and used his feet to wash it down the drain (also grateful). I almost lost track of time. When he turned around in the shower to shut the water off, I woke from my trance and hurried back into the house as quietly as I could. Safely in my bedroom, I listened as he finished in the bathroom and walked to his bedroom. I heard his door shut. Not being able to stand it anymore after what I'd just witnessed, I reached my hand inside my underwear which was by now hot and wet and orgasmed almost instantly. Since this has happened, I've snuck out for a few more peeks to watch him in the shower. He masturbates almost ever time he showers, and I've watched him masturbate into the sink a few times before the shower. I feel dirty, but what I see is so hot I can't stop myself.