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Oh! [She looks surprised but it's followed by delighted laughter, apparently not minding the drop in.] Yes, what can I help with?
[Before waiting for the answer she'll just lean in to kiss him. Totally normal, right? Sometimes she gives a warning, but by the time she gets it out she's usually feeling very anxious and full of geassed-up need and asking forgiveness afterward can be easier. Unless they dodge the kiss of course.]