An Apple of Good and Evil
This is by far the filthiest thing I've ever written...so I have to share part of it here. But not all of it. If you want all of it, you have to go to AO3 and read it.
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Slowly, quietly, Crowley slipped up behind the desk chair. He leaned down beside Aziraphale’s head and took a deep breath. Oh yes…oh his bastard of an angel was certainly pleasuring himself to the image on the screen. Careful so as not to get himself stuck, Crowley let his control of his human form start to slip. His clothes melted away as his lower half took the form of his natural snake self. He kept his upper half human as best he could, save for his tongue and teeth. Those he let shift as well.
“Pleassssssuring yoursssssself, angel?” He hissed softly, letting the tip of his forked tongue come out to flick against Aziraphale’s neck and ear. Oh he tasted and smelled devine.
Aziraphale gasped, quickly scrambling to try and close down the screen, only for his hands to be caught and held close to his body. Crowley slithered himself closer, seeking out the heat that came off Aziraphale in waves. So warm, so soft…
“Mmmm…my angel’sssss found a kink, have you?”
“C-Crowley! What…what are you…oh…oh dear…it’s not…I’m not…”
“Ssssssshhhhhh…ssssssssure you’re not. Jusssst like I’m not, either.” Crowley’s tail came up to slide over Aziraphale’s leg, up his thigh, and settled large and heavy into his lap. It gave a playful flick before falling still again.
Humming, Crowley leaned down to nuzzle at Aziraphale’s neck. The angel was helplessly trapped, right there in his chair, unable to do anything except let him nuzzle and lick and tease. A small whimper escaped him as just the tip of one of Crowley’s fangs nipped the lobe of his ear. Keeping Aziraphale’s hands in place with one hand, he used the other to run down Aziraphale’s chest, but stopped when he noticed the stark difference from what had been there before.
Again, Aziraphale whimpered.
Crowley glanced at the screen for a moment, then turned his attention back to murmuring into Aziraphale’s ear. “Issss that what you want? Did you change your Effortssss sssso you could feel what sssssshe feelssss?”
He licked across Aziraphale’s neck, long and slow and sensually. He could literally taste the arousal rolling off him. It was thick and heady and was slowly starting to drive him completely mad.