Callum didn't have a hangover only because he was all too aware of his limits. He was also discovering that there was a world outside of Eros. Vampires were proving to be really entertaining in their own way, especially because they brought in Muggle drugs that you wouldn't normally find in the wizarding world. It was almost like being back in the league again, which meant that while he didn't have a hangover he was hardly at his best. It was probably the only thing stopping him from getting up and leaving.
"It was fine. Thanks for the party, by the way. You didn't have to do that." He grabbed a cup of coffee and then poured one for Charlie before retreating into his bedroom and its darkness. Charlie could follow or not. He didn't much care.
In the bedroom, he fixed his pillows against the headboard and sat there, drinking his coffee, and of course, Charlie would come him, because he was a stubborn arse. "What exactly do we need to talk about? I thought we've talked. Twice for that matter."