HIHIHI NO FURTHER A MYSTERY

an acquaintance who’s in his thirties and savvy, with good friends of any age, works by using “hehe.” I find it charming—he’s a perfect speller, and he’s a energetic, tidy writer, and his “hehe”s are an odd secret. I know very well what they necessarily mean: helpful, to some degree sneaky giggling at a shared joke. But why the sing