I'm guessing most of the people commenting here don't read much manga outside DynastyScans?
Bleeding from the mouth is a typical way of showing emotional damage (since it's internal damage, d'you get it?) in comedy manga. The dude isn't actually happy, he's dying on the inside since he just got NTRed.
Also, his hair turned white. That's a trope which typycally doesn't signify happiness and approval. https://tvtropes.org/pmwiki/pmwiki.php/Main/DiseaseBleach