Caught him spying my aunt in bath (step brother)

Occasionally my step brother and I would stay over my aunts house if my mother or his father ever went out. My aunt who was his step aunt was a single women around this time in 30`s. Very big boobed brunette, quiet wealthy and enjoyed being single.

I kept noticing while we stayed there that my step brother would often go up to his room every time he heard the bath running or around the same time every time we stayed there. I never took much notice as I was watching a film or something. But this one time i decided to creep to the bottom of the stairs and up them. Down the corridor there was a banister which was linked to the bathroom wall. Above the bathroom door was a small glass window. I could hear music playing from the bathroom and peeped my head around the corner to see him standing on the banister, head slightly above the glass looking in on my naked Aunt in the bath! Cock in one hand and the other hand leaning on the wall. I whispered to him by name and he was startled luckily he didn't fall. he quickly put his cock away in embarrassment. I walked over to the banister to his surprise and climbed up looking in on my Aunt. I was getting a kick out of it I can`t imagine how he was feeling. This was the beginning of my Voyeur adventures with him. She lay there facing the opposite direction. you could see all of her naked body, no bubbles. Her tits were huge, I was so envious. I stayed there for another minute or so admiring her. It felt really wrong and naughty. I whispered for him to go back up. He did within a flash, his cock was still rock hard. The hardest I have ever felt it. He was shaking. I pulled his trousers down and began to wank him off. He didn't look down once. Ii knew he couldn`t shoot his load any where apart from my mouth. He put his hand on my head and guided me bobbing my head up and down to his speed. it wasn't long until he came, so much cum that I had to swallow straight away. He was shaking uncontrollably. I felt like his cock nearly doubled in width.

I knew this was the start of something amazing! I wiped the cum off my lips and went down stairs like nothing had happened.