A lot of very close calls but one stands out. I lived with girls at uni and almost/sort of did get caught by one. I was on my bed wanking, I heard my friend come in and she was in the hall way talking, I carried on as it was quite hot wanking with her just outside my room. I was having a great time and decided to let go and cum, I started ejaculating when I heard a knock, knock and to my horror the door opening while i was still cumming. I grabbed the bed covers and pulled them over, my cock still squirting cum. She noticed my awkwardness, red face etc as she came in. She didn't see anything but I still don't know to this day if she knew what I was doing. She came in (slightly drunk) and stood against the radiator to the side of my bed and we chatted. I don't know if she did this to pretend everything was normal and she didn't know what I was doing or she genuinely had no idea. Anyway the bedsheets underneath were soaked and I could feel it dripping down my leg as we chatted. Then I realised the room smelt a bit of cum and had no idea if she could smell it too!
After chatting for a while the awkwardness went a bit and I thought the situation was quite hot, sitting naked in bed, covered in cum under the sheets talking to a hot girl who I used to (and still sometimes do) jerk off over all the time, so started going hard. When she left I got back onto it right away and came again!