Flushed Chiyo sending Kaoru away on an around the courtyside trip to deliver stuff, on white day ...
Very clever mom, I know what you're up to, you're also getting a gift back huh.
Another factor would be the fact that he's the one of people who saved her aside from "Already taken, Married to Snake Waifu" Jurota, so she's very sure that he's someone good that she can trust.
Tho it's funny in a sense that, it isn't "adult grooming child" but more "child groom adult into accepting her"
Poor Kisuke, Lured and Trapped by Child