Answer to (and dedicated to) Persephone Lupin's little challenge: Sirius had to be paired with Filch. And Azkaban should be the more beckoning prospect than knowing Snape was with Remus and had taken custody of Harry.
5. Seriously Sick
Life could always go downhill in a matter of seconds. This wisdom was not only Draco Malfoy's; Sirius Black could say so, as well. One day, his life was the normal everyday routine and "Bang," out of the blue, he saw himself sentenced to a life penance in Azkaban for a crime he hadn't even committed. Formally, his life had consisted of flirting with everything that moved (and couldn't escape fast enough) and playing pranks on the greasy git. After the twelve years of forced solitude (alas, not leaving him the most sought after bachelor alive), Sirius had to experience the coldest bucket of ice water as a wake-up call ever. Today, he didn't even know what the meaning of 'flirting' was, anymore ("It's just like bicycling? Pah!"), and he was convinced that the greasy git had turned the tables and played an evil prank on him. Not only had he warped Remus', whom Sirius knew like himself, mind, but the slimy Potions master also dared to take custody of his own godson! Sirius was certain that after he had broken out of Azkaban, he had ended in some kind of alternate reality; how could there be any other explanation for the fact that Harry was in love with Draco Malfoy and Remus was together with Severus Snape of all people? It was just so wrong. Nobody should be allowed to fall for Snivellus!
Sirius banged his head repeatedly on the table. The sound echoed in the large kitchen of Black Manor, but no one was with him to witness it.
It was just so unfair. He was the good-looking chap, after all, well, had been ... but there were still traces left and with some imagination ...! Merlin, he was pathetic. Whining over the fact that he didn't get any but Snape did. How deep could one sink? Sirius couldn't possibly get any lower.
He threaded his fingers through his long hair, groaning. Life just sucked; from his point of view, at least. Poor Remy in the fangs of Evil Incarnate and his beloved, innocent godson seduced by the Spawn of the Devil? It was more than Sirius could bear.
Yes, he could indeed sink lower.