Why are all these characters speaking in such ambiguous terms? (I mean in manga in general.)
I understand the comedic effect, but it's getting too predictable to stay funny.
"Go out with me"
"Come to my room"
"I like..." (This one works better in japanese with their habit of omitting tons of "obvious" words and pronouns in their sentences.)
Given how their meaning is generally easy to mistake in most contexts, most people with common sense would know better than keeping it ambiguous.