Quite thick actually. Some people can't understand things unless they're spelt on a neon-lettered sign right in front of their face.
Myself, for example.
Uuee...
Uueeee...Aa, no good, it's leaking isn't it? Hurry to the toiletAah, Udonge-chan, what's the matter? Need to go to the bathroom?Uuuuu...Uuuu~!!
Uuuu~!!What's the matter, geez...c'mon, come over here...
You really are cute, aren't you...