Becoming a Clean-up boi

She looked over at me and simply said, 'you're going to have to clean it up without any help this time.' I stared up at her from between her legs, not knowing what she meant, then I started to get up to go to the bathroom to get some tissue, but she firmly guided my head back down between her legs and pushed my face into her especially wet pussy. I realized too late that this was one of those nights after which she had made me wait for over a week without any sex, so I knew that I had shot what was, for me, an especially big load.
although I didn't like the idea of sucking out my own come, I did appreciate and enjoy, very much, being allowed to do something for her in such an intimate way. I felt good servicing her and cleaning her up and hoped that she was appreciating what I was doing and even enjoying it. This change in procedures quickly became the norm, and whenever she allowed me to shoot off into her, she immediately made me go down on her and suck out all of the fluids. Or she would have me lie on my back so she could sit on my face, something she had never done previously, pressing her big wet pussy against me, urging me to 'suck out all that nasty mess' I had made. In this position, which she seemed to enjoy, she would slide around on my mouth and nose, occasionally even cutting off all my air supply for a few moments, laughing and teasing me, 'oh, does my little man need some air?' then she'd give me time to gasp for a quick breath before planting herself again on my nose and mouth to torture me some more. (A segment from A Dominant Wife by Anon.)