Ambush would be a nice way of putting it. And when Hannibal approaches him, offering to pour him a drink, he lowers his brow as he sizes Hannibal up.

"Are you the one who left the note beneath my door? You'll have to excuse me if I'm not so inclined toward sharing a drink with someone I have no intention of dating. Much less I don't think I've even seen you before. I'm certainly not partial to stalkers."

Blunt and straightforward, Yukari sets it at that - his full opinion on this invitation matter.