Looking for Doujin

Possibly a tankoubon, collection of short stories, to be more accurate. However, I vividly remember one particular story in general.

Lady is at a Pachinko parlor, clearly with a gambling addiction, wasting her husbands money away. Here comes in this Guy, who has seen her around a couple times, that notices that she's not doing so well at the slots. She looks troubled, as she mumbles about not going to make rent or how she'll be able to explain this loss to her husband. Guy tells her that he won it big and ask how much she'll need. She hesitates and holds up 4 fingers. He was willing to help her out...not for free, of course. Next scene is in a hallway where she's giving him a BJ. They finish up their business, she gets paid, she regrets. Next day, her luck is still pretty bad and he offers more money, things escalate. Eventually, sex with condom and to her dismay, she enjoys it.

On another day, her luck seems to turn around and she's in the positive, unfortunately for Guy, not so much. She pulls a reverse Uno card on him and asks him how much. Sex ensues. End.

If anyone can provide the sauce for the author's name or the name of the doujin/tankoubon, I would appreciate you.

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