One Slice Missing

Seven guests. Seven pieces of you. One of them will ask for a flavour you have already given away.

You are the cake. Tap a slice to serve whoever is in front of you. The pantry on the left is what is left of you; the column on the right is who is still coming, so you can see the shortage before it lands. When the slice is gone you choose: hand over a wrong one (it costs a candle), let them wait, or give them yourself.

Three endings. One input. No score.

One ask, if you play: tell me where the shortage caught you, or that it played clean. One line.