It's such a tragic and wrong development 1/2
[It's too bad puppy eyes are about as effective on Sebastian as... I don't know, literal puppies. And somewhere in the multiverse, Tanaka looks up from his tea and shakes his head at his failure of a successor.]
In this strong sunlight? The ganache would melt much too quickly, and even though the cake consists of four [~*~*~*~] layers they would all rapidly grow too moist as a result. What kind of Phantomhive butler would I be if I dared serve anything but a perfect cake?
[If it weren't for that, of course~~ he'd be happy to grant the young master's wish. Alas!]