This happened a couple weeks ago and even though it made me horny at the time, I really don't know how to feel about it.
Kind of late one night, I walked down to my son's room to ask him a question since I knew he was up from, what I thought was the light from the TV. I looked in and saw him but he was on his computer, his shirt was off, his pants were around his ankles and his penis was in his hand. Now, I have seen him naked from time to time, either walking out of the bathroom drying off from a shower or getting changed for the pool, but never with an erection and certainly never like this. He was watching a video and masturbating along with it, and when I gasped at what I was watching he looked over and saw me there. As soon as we locked eyes I spun around and flew back to my bedroom. I couldn't believe that I caught him masturbating, but I was worried that he was going to be mortified. The next morning however, he came downstairs and acted like nothing had happened. Neither of us brought it up, so I figured it was just an isolated incident and try to forget that it ever happened.
That next Saturday morning however, I was going to get the dirty laundry out of his room, and since the door was closed I knocked and he said to come in. I went in casually, but there he was again, laying on his bed naked, legs spread apart and stroking furiously while looking at his phone. Not looking away from the screen he asked what I needed, and I stammered and said I was gathering up dirty laundry. He said OK and that it was all in the hamper, and while I was collecting it, I saw him out of the corner of my eye grab the tissue by him and he came with me right there. I wadded it under my arm as tight as I could and practically ran to the door. When I got downstairs the only image I could see was him masturbating with no shame. Not only that, I was wet. My boy, looking so much like a sex-fueled man got his mother horny. I pushed my pajama pants and underwear to my knees and fingered my wet pussy leaning back against the washer, toes clutching the inside of my slippers. It didn't take too long until I took a deep breath and came. When my head was straightened out and the guilt hit, I was a sloppy mess. I took off my underwear and wiped myself off with them, then tossed them in with the rest of the wash. I didn't even bother replacing them, just going without since I was busy.
Later on that morning I was sitting in the kitchen with the newspaper and I heard him coming down the stairs, and this time I was going to ask him why he did what he did. He rounded the corner and I couldn't believe it, he was still naked, not a care in the world. He went and filled a glass with water and was about to leave again when I stopped him and asked what he was thinking. He just stood there and shrugged, then said he did it every day, sometimes two or three times. The whole time this was going on, his naked penis was right there, almost staring me in the face. I asked him if he was planning on getting dressed at all today and he said he doubts it, he's just going to be hanging around in his room. I just kind of chuckled and shook my head, and he turned around and went back upstairs.
Later on I went back up to my bedroom and what did I see on the way? There he was standing in the bathroom in front of the toilet, one hand on the wall and the other stroking his again-hard penis. I almost told him that was enough, but I walked away knowing that I shouldn't stop him, he's a boy and it going to, no...NEEDS to masturbate. I just can't decide if I need to tell him when or how. I mean, if he thinks it's such a normal thing that he doesn't mind his own mother seeing him do it and isn't hurting anyone, why should I stop him?