Well, she's actually going for it. Still, just saying "keep it up" would have had less potential for backfire than deliberately provoking him with the sexy, but I guess setting up a backfire is the only way to keep the gag funny. Even so, it's nice to see her actually get some degree of revenge, rather than everything she does wind up with his nose in her crotch.
Don't you think this summer's been hotter than Hellll?Well, besides that, hasn't it been really hot, recentlyyyy?Howzzat?*flap**flap*Now, now, Murakumo-kun, a girl shouldn't behave like th--
*BLARGH!*Vomiting blood?!