Probably fire? Maybe he got too hot from the steamy act and overheated or smt
Ok I have no idea why that shoulder lifting emoji turned into woman sign
Remember Rei's father was badly affected somehow by sleeping with a human, and it shortened his lifespan? (Or maybe he just died early from being such a jerk to his kid, hmph.) He was cracking too - in the top middle panel: http://www.mangago.zone/read-manga/theo/uu/theo-chapter-2/25/.
I think something's happening to Rei's body because he and Theo had sex, but I'm hoping because he's half-human it's not bad.
Thx that explains it
What was that at the end?
THAT 'creak' or 'crack' noise?...