Also, I know there are tags in this comm, but I haven't figured out how to work them yet (this is only my second post), so I'm just going to leave this entry untagged. Sorry if that creates extra work for a community admin.
Thank you in advance.
Edited to add: And thanks to the fabulous dinara_n, I have re-found this fic. It's Sing Me the Alphabet, by TheSardine.