I guess Yuki is fairly aware she almost killed Gary when he infected her with the 'Het' so the fact she openly declares he intention is somewhat sweet.
Here is the dilemma... Yuki's clearly insane at times... but at the current moment said Crazy is aimed at Matt who is the resident HATE sink of the characters despite attempts to make him sympathetic. Yuki regresses back into being over the top insane to torment Matt or Yuki finds other ways to deal with her issues
Why bother? Matt is superficial as spit. The blonde wig and wardrobe would suffice if Yuki hadn't put his junk out of commission for several days that one time.