This happened not too long ago. If you know this is you A.S then let me know what you thought.
I lived in a house with a few other people. I shared the basement with a girl.
It started when I woke up, half asleep and walked into the bathroom. I was just wearing some tight blue briefs which was showing my rather large bulge.
As I opened the door I saw my flat mate doing her make up in the mirror. I apologized and she said 'don't worry I should have locked the door'.
We chatted for a few seconds and I felt so horny as she must have clearly seen my bulging briefs.
A few days later I woke up. I had been playing with myself and was still half hard. My room was next to the shower room and I noticed my door was slightly open.
As I went up to the door I stood there with my heavy cock hanging nicely as A.S walked up with her towel wrapped around her.
I quickly said 'oh sorry' but chose not to cover up as I was feeling brave.
She then looked down and saw my cock hanging. Her eyes stayed on it a little longer than I expected, she didn't seem offended at all.
I then went back into the room and jerked off at least three times.
I would then get changed with the door slightly ajar or 'accidentally' bump into her in the corridor and have full conversations while my cock grew hard in my tight briefs.
I always wondered what she thought or if she even really noticed at all.
I moved out so I guess I'll never know.