An idea inspired by something someone suggested a while back.

It's pretty self explainatory. As Xerxes increases in size, he finds fewer and fewer places to contain his tremenous bulk while he rests, so we gave him his own sofa.
However, his non-stop eating meant that it was only a matter of time (a few days) before even this 'king-size' couch fell apart under the pressure of his ever expanding girth... which at this point shows no sign of stopping.