My 12 yr old daughter sleeps nude. I don't know why or when it started but about 3 months ago I went into her room to see if she'd taken my phone charger and she had kicked the covers off in her sleep and was laying completely naked on her bed. She has a night light and I could see her clearly. I remember thinking I should put the sheet back over her but instead I just looked at her. It took me a minute to realize I had an erection. I took my boxers off and stood next to the bed and masturbated. I came quickly on her sheets. It was the hardest erection and most intense nutt I'd had in in a long time. Now, every few nights I go into her room naked and jerk off while she sleeps. I last much longer now though and some times spend an hour standing by her bed stroking myself. I don't want to risk waking her so I never cum on her skin but I cum on the sheets between her legs or on her pillow or in her hair.