This week, I have a guest, again. (He wrote about Cooking with Grandmothers a few weeks ago.) This guest is writer and excellent person K'eguro Macharia. He is the author of the book Frottage: Frictions of Intimacy Across the Black Diaspora, winner of the 2020 Alan Bray Memorial Prize. He lives in Nairobi, and you can follow him on Twitter, where he tal…