I think it will go like this
Chapter 38: sex before match ... Think the most crazy shit that you can
Chapter 39: loosing the match, probably getting hospitalized
Chapter 40: the big downfall ... He'll blame everything on Dan and I really don't know. There is a limit in my imagination that mingwa keeps going further than it. It can be anything really.
I agree except on the crazy sex part. Probably the crazy sex comes after he loses and he super offends Dan saying something on the lines of "you're even a mediocre sex toy, i have no use for you anymore" or something like that. Revenge sex for not winning the match. Dude's a full douche, no doubting that.
So I think next 3 chapters we will have a combination of: Seme losing the match, blaming Dan for losing, Granny dying and Dan blaming himself and quitting, seme going out of his fucking way to deny he's got feelings for Dan. Tsk tsk.