@DR-ZOIDBERG :
If you had read the story even a little bit, you'd know that he has already tried nearly everything.
From a LOT of sports to dieting... maybe you should re-read it?
I like Shin. He atleast is completely honest with his feelings and doesnt beat around the bush. Unlike most MCs who make their love interests false hope or misinterpret by beating around the bush. I like this forwardness
"Give me your Finger" cause yakuza, when they cant pay up take fingers as payment or also if their members screw up. In an earlier chapter he wanted to sacrifice his finger cause he screwed up (his wife stopped him)