I tend to see the Aces as undifferentiated aspects of their particular suit and/or element. So the Ace Cups as how person X sees person Y says to me that Person X's feelings haven't quite coalesced yet. There's a lot of feeling there (and in most decks, that feeling is flowing over the edge of the cup), but it hasn't turned into like, love, lust, hate, etc. yet. Basically, person X feels something, but it's too soon to tell exactly what.
Smile. It makes people wonder what you're thinking....