I admit my hook was quite subtle.

Yvonne did mention Donnalaich mid-tantrum, and that's where Fel is headed too. Just be all like, "Whoa I know you're cranky right now but you said you were looking for the city of fae? We should search for it together because we're both going to end up there anyway, right? I promise I won't fling any fireballs." Something to that effect, haha.