Hm... anything at all, no consequences, you say?
...If that also counts for contract-bound demons, then..
-I'd slap the hell out of Ciel Phantomhive for being a brat.
-I'd buy Ciel a bunch of boxes and call him Box-chan.
-I'd kill the entire garden and trim the hedges into skulls.
-Then I'd serve Ciel tea with Pluto's excrement in it.
-And make him cake with Pluto's excrement, too.