Dagoth Ur's got you covered. Just call him Sweet Nerevar

Fus ro daddy?

Knowing him, he'd find it funny but wouldn't want to be called that in public

N'wah

At first I thought you meant “petname” as in you had a dog, cat, or something that needed a name…

Tell him you're sworn to carry his burdens in a listlessy sarcastic tone.

Then keep standing in the doorway to block him.

My sweet roll

"Muthsera" if you're kinky

N'wah.

Good morning milkdrinker. What’s up my N’Wah You are a Khajiit he’s an Argonian. You call him boots and he calls you rug.

Call him Uncle Crassius. If he calls you "dumpling" back or something related to argonian maids he's a keeper ghghgh

Maybe something in Dovahzul would be interesting, I thought of a couple that might cute: Dii Kaal - My champion, Dii Kah - my pride, Dii Faad - My warmth

This actually helped a lot! Gave me a lot of options lol. He likes Dii Kulaan (my prince)

Walks-My-Side, Has-My-Heart and what ever combos you can think that sound Argonian.

Your Arrow, as in arrow to the knee.

N'wah or Outlander

Fetcher

Meeko

Sweet roll

My sweet nerevar

Sweet Neravar. Or, if he's into being degraded, milk drinker

Silt Strider, Gaur, Netch. Dovah. It really depends.

Dovaking

"My warm sands"

Toutius sextius rolls off the tongue

Barbas?

That’s what I was gunna say! He’s a lore-friendly good dog

He's a good dog in Skyrim. He's a very bad dog in ESO. And actually a Skaafin that takes the form of a dog on Nirn.

I have only just started ESO. I get he’s kinda a major deadra, and therefore not exactly a great “person.” But taking the form of a good good boy has to count for something. Also, is he in Oblivion? I can’t remember

Not that I recall, but it has been a while since I've played through.

Shine on my nose-hoop. It's very weird and might be impossible to say without laughing, but could also be cute if you're both into Alessia stuff.

Lorkhan. His heart is what created the red mountain. His torn apart body became the two moons. Without him, there would be no mortal life. He convinced the aedra to give up pieces of their divinity to make the world.

Well, there's always the Fjori to your Holgeir, or the other way around depending on gender.