Caught him wanking.

I walked past my step brothers room one morning and couldn't hear much and though of this as being peculiar. I slowly moved my head around the all ready slightly open door and could see him with his back to me watching porn having a wank. His dick looked huge. I went to my bedroom slipped on a low dress, took my knickers off and reached for my phone. I text him: coming in slow down. I walked to his room opened the door and he was just continuing like I wasn`t even there. I lifted up my dress went and sat on him on the chair. His cock was soaking and slotted inside me in seconds. I sat down completely on him facing him as the porn continued in the background. His cock went deep inside me and slightly took my breath away. I continued bouncing up and down on him with his hands all over my ass. I could feel he wasn't far away from cumin. I felt his hands grab my ass tightly as he whispered to me i`m cumin. He couldn't make too much noise as my mum was still sleeping in her room. I felt his cock go very hard and as he thrust inside me slowly but deep, I felt his cum shoot at the back of my pussy. it felt like his cock had grown inches and thickened. His eyes lit up.
"There that was much better than a wank wasn't it" I whispered as I came off his cock. As I walked away I said cheerfully "See you later."