How does a Lilim handle two people calling in favors at once?
Heh. A very, very clever Lilim would try to work it out, somehow, that both are satisfied. More likely she will experience dissonance and possibly Discord from the conflicting favors. Other avenues might include trying to re-negotiate the favor so they don’t conflict or asking someone else to help resolve the situation (which might involve yet another favor being issued). Lilim may refer to this as Geas-conflict, especially if the Geases aren’t just inconveniently timed, but are actively opposed.