He had honestly tried. But one, how was he supposed to find someone who wanted to jump out of a cake? And two, when he had tried to just cut out a hole, the cake just collapsed. "Ill get started on it tomorrow at work, just for you."
"Well, by all means, explore!" He held out his hand, gesturing to the rest of the party, smiling. The most important part was that Sirius enjoyed the party.