there is something so precious and saddening with the way aziraphale touches crowley and the reason is really as simple as wanting to love like a human.
an angel, who has repressed his emotions and pleasures to serve God, ends up finding the desire to feel mundanity: from eating, oh those delicious meals, to craving the skin from his most loving sin crowley, so many decades, hundreds, thousands of years on earth and, what do these two find the most fascinating? exactly, human love. however, it seems that aziraphale has found something so enchanting about human touch.
that's why every time he finds a moment, he delights himself by touching crowley, caressing him, holding his hand and grabbing his shoulder. it's not a simple act of love, it's the fact that he recognises his deep love for crowley with those actions because, curiously, he doesn't touch nor lets him be touched by anyone else who is not crowley.
yet crowley seems to restrict himself from touching aziraphale because he knows what it could cause and always composes himself - which contrasts with aziraphale's character. even so, this doesn't happen with their dance. for the first time, he reciprocated that act of love to the point he ached for intertwining his fingers with aziraphale. however, what crowley didn't know is that he woke up on aziraphale a more carnal desire with that first and last kiss.
two acts of love melt at the same moment.
aziraphale could live being the one who started physical touch but, how is he supposed to continue with his existence knowing that he has tasted something more pleasurable, more intimate such as crowley's lips? feeling crowley's mouth on his in a desperate act to which aziraphale could only reciprocate back with poor attempts of slow caresses.
how is he supposed to be a supreme archangel if he can only think of crowley touching him for the first time in millions of years? if his fingertips unconsciously run his lips to recreate that kiss? is that the human love he always read in his books?
that's when he realized that human love is more than just a mere act. it's like the flames of hell took over aziraphale's holy self and burnt him with no pain because, definitely, there is no sweeter innocence than their sin.
if nothing lasts forever, then just touch me once more. kiss me once more so i don't forget how your skin had once felt on mine. just like real people do.
