Beyond the Roundels

I signed up again at hc_bingo, as even though I failed with the other one, May is for Small Fandoms, so surely I can manage something? For May the challenge is to use one or more or all of my given prompts in one work for a small fandom:

phobias	combat
deals with demons	allergic reaction

I haven't had any thoughts on what to do yet, so suggestions welcome! (I've only got as far as thinking I'll maybe see if there's something that fits from my S&S list of prompts, or 500 prompts... & speaking of the 500 prompts thing, more of that later.)