Tbf I think lick me if you can could be your first option because it gives context to the miller's parents Ashley and koi, but the other stories could be read differently, my suggestion would be to read kmiyc before this one, and once you've read this one you can read run away if you can (I don't really recall if that's what Nathaniel's story was called but it's the next one to desire me) then you can read deflower me if you can but it's not finished yet I think. My only one suggestion would be to not read eat me up if you can, that's the Miller's grandaddies story which is actually very messed up because of Dominic Miller (Grayson's grandpa) let's say it's very much criminal, lmao.

I only learned today that zig had an interview wherein she told how to read this series in order. That Lick Me if you can must be before this. Anyone who knows the order the author said?