I forgot the name of the title. But I remember that the MC was a world hopper and managed to determine if it was ML through a red spot on his *cough* "bird" *cough*
Heroic Death System has it on hand The Villain’s Face Slapping Counterattack has it "ahem, blush " there
I remember one where the MC had to check the MLs butt but I forget the name lol Or it might've just been near the butt I forget, either way he had to find a way to get the ML to take his pants off lol