There's nothing for it. Drained as he is, Crowley still has to dive in for another kiss at that, fervent and passionate.

"Sod my dignity," he manages somewhere during this activity, pulling Aziraphale in as close as he can manage. "Tattoo it on my forehead. Dearest Crowley, if found please return to Aziraphale. Call me it everywhere, all the time. Never stop."