Lmao my first thought would be "why tf was he blushing when talking about a literal monster" if I was a normal person and didn't understand that kaii-san is indeed worth blushing
They're the kind of couple that, once they cross that line of kissing, suddenly realizes that they've BEEN dating and didn't realize it until that moment.
What was that red trash jump scare at the end, is he gonna message FL? And ml will see? Let's hope yes cause I love the drama