Percy realized that the moment he had infrequently dreaded had come. Despite his position at the Ministry, his salary was a paltry one. Though he and Oliver had years ago decided it was far better to share a flat than to live on their own, Oliver was - or at least he had been, before the incident with Ubbly - a highly sought after Quidditch player, and was compensated accordingly.
"Yes, you do," Percy hazarded in response to both Oliver's penchant for rambling on about matches and his need for a shower. His next was a guess, voice twinged with disappointment. "But I know what this is about. You've gotten serious with a girl and want me to move out."
Why else would he roll around in the mud and refuse to tell Percy about it? Well, there were other reasons, maybe, but for Percy those were even worse than homelessness.