If you have a specific pairing in mind, you could format like this:
[GEN] or Charles/Erik
If it's more of an ensemble thing where several pairings are possible and you don't care if there's romance in the fill or not, you could just say [GEN] and add a note about being open to pairings in the prompt itself. You could also use this:
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timeasmymeasure
no subject
Date: 2011-12-30 06:43 am (UTC)[GEN] or Charles/Erik
If it's more of an ensemble thing where several pairings are possible and you don't care if there's romance in the fill or not, you could just say [GEN] and add a note about being open to pairings in the prompt itself. You could also use this:
[GEN] or Any/Any
Hope that cleared things up for you!