I'm actually 16. Well at night I get really horny, and one night I decided to go into my sisters room, remove her bed sheets, and slowly pull down her pj's. I couldn't really control myself so I took off my clothes and got on her back and started dry humping her ass hoping she wouldn't wake up. Then I went to her head, moved it to the edge of her bed and started to rub my penis against her lips, and then I came all over her cheeck. I was gonna wipe it off, but, she woke up.