Eric had mated with many merfolk, men and women, as both a man and a woman. He'd mated with several humans, too, over the years. They all varied, in body shape, in desires. There was no one thing, no one ideal, that did it for him, that got him going. It was a combination of personality and something interesting about the appearance of his lovers that sparked attraction within him and Gabe, with his lanky, yet muscular form, was definitely interesting.
And he was so reactive. He swore, shook, groaned, making Eric twitch in his tight jeans, an ache that would need to be scratched eventually, even if Gabe didn't want to take care of it himself. Eric was focused, though, focused on making this good for Gabe, bobbing his head, speeding up that intense rhythm.
He could tell that Gabe's muscles were straining with the urge to buck up and he slipped off Gabe's cock with a slick pop, just long enough to speak, his voice rough and hazed. "You can move, fuck my mouth." And then he was bending back down to get back to work, Gabe's cock stretching out the back of his throat.