I was 17 when this happened, I went to a sleep over to my best friendsīs house, it was a Friday night when we went to sleep after a small party with our friends in high school. She had to get up early and leave as she had band practice and I could stay sleeping at her house because I already had her familyīs trust.
I slept until 10am and her mom who is divorced woke me up, needless to say I had a boner when I woke up. I didnīt really care as I sleep in my underwear and with a shirt I knew my momīs friend already saw my boner, she left the room telling me that she was going to make me some breakfast, but before leaving the room of course I needed to take care of my boner. I masturbated really hard as I needed to go out and have breakfast, thinking about my friendīs mom and the fact that she saw my hard dick before waking me up. I came on my underwear and stood up and left the room, breakfast was not ready yet, so she mentioned that if I wanted I could take a shower and she would take my clothes to washed it.
I went to the bathroom and took my clothes off and got in the shower, she came in and took my shirt and my boxers and left. I finished taking the shower, covered my bottom with a towel and left to my best friendīs room to put some clothes on. Her mom before I got to the room said "did you have a good time masturbating because I can see the stain you left on your underwear, donīt worry I wonīt say anything and the stain will come off...." I didnīt really say anything and just came in the room, masturbated again and then had some breakfast and left her house.
Ever since that day when my friendīs mom looks at me I know she knows I masturbated at her own house, I also get aroused and still masturbate to that day.