Sister Sleeping Abuse

I keep waking up with cum on my face and in my mouth

I haven’t told anyone about this, even my best friend, but I keep waking up with cum on my face and last night it was even in my mouth when I woke up. I’m only 13 and I live with my younger brother (11) and older brother (22) and our mom so I’m not really sure who is doing it. I tried to stay awake last night to catch whoever is doing it but I fell asleep anyway. It’s really embarrassing but I am thinking about sleeping naked tonight just to see what happens, is that bad? I have never done anything like this except for a little kissing with my best friend but thinking about one of my brothers looking at me naked sleeping kind of gives me that really good tingly feeling between my legs. I know I don’t really have boobs yet or anything because I’m pretty small but still. Let me know what you guys think I should do please I am really naive. Staying up that late is easier said than done I have school so early and have to put my phone up for bed so there is nothing really to keep me up but I am going to try. Thanks guys

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