The guy tied to a chair

I got a guy to sit in a chair with arms so I could tie his arms to it I pulled down his trouser so his bottom half was naked I pulled his foreskin back then walked about 3 meters away and stripped then layed down on the floor with my legs open stroking myself watching for the guy to get hard once his cock was standing up I went over to him and gave him a suck then told him to point his finger up so I could sit on it and bounce then facing away from him so he could see my bum I opened his legs so I could get between and using my bum cheeks I placed them either side of his cock and started going up and down I walked away and started stroking my self getting carried away I accidentally made myself cum so I wiped it all over my bum hole then walked back and carried on doing what I was doing to the guy my movements were abit longer and being lubed with cum the guy thrust at the right time and his cock slipped in nicely so i bounced hard and fast then started to feel his legs shake then he moaned as he was cumming :)