Hopefully Crowley still remembers how to deal with his suspenders and his buttons, both of which are not so much complicated as they are just well-worn, very aged. "By that sin fell the angels," he chastises against Crowley's throat, helping him out with his extremely aged trousers. He does have slightly more modern undergarments, if only because they're not quite as robust as outerwear.

Not that he actually needed to do so, but he does very helpfully guide Crowley's hand to a spot between his legs, even as he dips his hands into Crowley's waistband. He almost seems too excited to say: "Flesh stays no further reason but rising at thy name."