“A” stands for

Dave sucked in his cheeks and breathed through his nose. A blissful consonance descended over his face, signalling that he was ready to receive. And I was ready to give. With a few final thrusts I reached deeper in him and exploded. He did choke now, but I held his head firmly and unloaded in his mouth without giving him a chance to retreat. He did a commendable effort to swallow and regain control, and he managed, more or less. But he couldn’t prevent quite a bit of my jizz to spill over his lips and down his chin. I kept fucking his face until my pumps ran dry, let go of his head and gently slide in and out a bit more to relish the feeling of his tongue and lips sucking and lapping, making sure he got the last drops from my glans.

Next he moved to my shaft and sack to reclaim the spoils he had spilled. He licked it all up, sucking my balls again and smooching all of my cock, giving me an exhilarating after-joy of almost unbearable tingles.
I suppose he had seen more porn movies or magazine imagery, because what he was doing was something that hadn’t crossed my mind. It was something I definitely wanted to try myself. I had held and caressed his balls with my hands, but the thought of taking those delicate eggs in my mouth, nibbling and sucking on them reinvigorated my already waning erection.