Watching My Brother Masturbating

This is a True Story,
Quite a few years ago I was staying at my brothers house in Peterborough, While visiting other family & friends.
One day I had been out visiting friends, I came back early than expected,
The patio door was wide open, I called my brother but he didn't answer, But I could hear a TV on upstairs, So I went upstairs to tell him I was back.
On the way upstairs I could hear some strange noises, I thought he had a woman with him in the bedroom.
His bedroom door was slightly open, As I got closer I realized it was a porn film he was watching, & I could see him in small mirror stood in front of the dressing table, He was totally naked Wanking himself off.
At first I started to back away from the bedroom door, But it did excite me seeing his hard cock.
So I decided to have another look, This time I sneaked past the bedroom door.
From that side I could see everything, His cock was rock hard He kept teased his knob end & feeling his balls while wanking.
I admit it was a real turn on for me seeing my brother totally naked & wanking.
After about five minutes he started grunting, Then shot his load over the dressing room table.
I was shocked & couldn't believe what I had just seen.
I thought I would embarrassed him, I walked into his bedroom & asked if he enjoyed that, He didn't know where to look he was so embarrassed as he tried to cover himself up, I said it's to late trying to hide it now I've seen it all.
I said I hope your going to clean that mess up, referring to the Cum splattered dressing room table.
He was so embarrassed all day.
But I admit it really turned me on, I couldn't stop masturbating for the next couple of weeks after my little voyeuristic experience.