The Joker is awfully domestic, in his way. He makes pretty clothes. Nathan's perfectly happy to be a clothes horse for his sartorially-inclined mate. Some of the clothes are distinctly feminine, and Nathan does not wear those, although the Joker could probably talk him into a kilt, even if that's not a Manx thing but only their neighbors.
"...Would've expected that to throw him a little more," muses Nathan.
"Amumumumum," Kerron says, still gnawing on his chewtoy.
"Why yes!" says Nathan. "That is your mum. Sort of." Pause. "What shall we have him calling us?"
"Maggie and Gianna have their kid calling them Mum and Mamma respectively," says Nathan, "if that's any useful guide. But you probably are going to spend a decent fraction of the time being more mummy-like than papa-like and maybe it'd be simpler to carry on with that regardless." He shrugs. "I can be Daddy."
"Okay," giggles the Joker, and he kisses the baby's forehead. "Your daddy is the cutest vampire in the world," he says brightly.
"Wrrrm," asserts Kerron, peering at the Joker like he's a kaleidoscope.
"We could take him outside," Nathan proposes. "He won't sparkle, just sorta glow like he's an overedited ad for makeup, no particular security risk."
Outside they go! Kerron is fascinated by everything, but most especially people; some of them he waves at the same way he was waving in the Joker's direction minutes ago. He babbles the entire way.
"Awaaa," says Kerron.
They are complimented six times on their baby by the time they finish their walk. (Nathan translates, on occasions when these compliments are not in English.)
"See? Cutest munchkin," he says, hugging Kerron. "And a buncha people you're never gonna see again think so too."
Inside the capital compound again, they run into Alice and Jasper, who are sitting together looking out the window with Alice's head leaning on Jasper's shoulder. "Hallo, Alice, Jasper," Nathan says. "Look what we made!"
Alice looks and says "Awww!"
Jasper looks between the parents and says, "...Made?"
Nathan hands Kerron over to Alice, and she laughs and tosses him into the air. "I haven't been able to see either of you for weeks, now, not that I was trying often before," Alice tells Nathan and the Joker. "Soon I'll have so many blind spots it'll make more sense to talk about where I can look."
"Maybe when there are enough hybrids and wolves getting in your way your power will say oh, for heaven's sake and let you observe them too," Nathan suggests.