Using fave instead of oshi again? I think if you're reading a Manga with Otaku in the title, you're probably familiar enough with oshis that it can be a japanese to English loan word at this point. Nobody's translating Otaku either.
It depends on how the water level changed last. If it got to halfway by pouring water in then it's half full. If you were emptying water until it got to halfway then it's half empty.
Good thing Togawa wasn't here.
This is probably a good thing, laughing is one of the more normal reactions. Mamoru has gotten too comfortable letting them rip in front of people.