"Fair enough. Where d'you want to be bitten?"
Nathan is a bit of a traditionalist. He goes for the throat.
It tastes... different. About as pleasant as a decent synthetic, but not the same as any of the available synthetics, and definitely nothing like a human.
"Nice," comments Nathan, after he's helped himself to a reasonable amount and sat back. His eyes have gone a peculiar sepia color, neither his usual red nor the black of the demon's blood. "Not like anything on the market, not like human, but nice."
"It changed your eyes," he observes.
"Oh? Bubbly or animal blood makes 'em gold, human blood makes 'em dark red, being thirsty makes 'em black, what do you do?"
"Peculiar." Nathan peers at a stray droplet. "Yeah, I have no idea how that works, bubbly is actually gold but animal blood is not... Anyway, thanks!"
He tilts his head consideringly.
"Now that I know I will not rip your limbs off, shall we try the other arm?"
Nathan swaps arms. "You think this'll go differently?"
"Let's find out," he says, and shoves Nathan's hand with all his strength. There is a measurable period of acceleration before he is going all-out, but when he is, he is definitely stronger.
Is stronger too.
But he loses.
"...Huh," he says when the rock shatters against his hand. "Apparently you've got more strength-enhancing properties than humans do, as a dietary supplement. Better mind who's asking for nibbles when the Ultra Olympics come around."
"You can participate in the Ultra Olympics as a steroid," he suggests. "Emmett'll flip."
"Emmett will flip," snorts Nathan, retrieving his hand again. "He would be very disappointed if any of his participating athletes were, er, drinking up."
"You are both very sweet," the demon declares, and he arches his wings around them.
Nathan is happy to distribute squishy hugs but does not like to receive them, so this is good.