I don't think that there's much in the way of backstory? Like, their careers did overlap, but that's all that comes to mind.

So did hers.

She has her eating out of her palm.

There's always a bigger yandere.

Back in my day, when we went to the internet in the snow uphill both ways, that would've been a 69.

And so, Nature became a mother.

Cat and dog, actually.
You could call them a...catdog.

Digi-chan is already dead, she just froze in place.

Infirmary? She's heading right for her lab.

I'd put my money on Yura pushing her off or slapping her or something.

They had much Exterminating afterwards.

Well, that's one way to commit murder.

Hakurei Shrine "Maiden" found to be in bed with enemy.

The only acceptable Kronii ship.

The author probably has a feet fetish

Only probably?

And that's how Teio was born.

One of them can call forth eldritch powers beyond mortal ken, and the other has a ghost dad.

I imagine that the ghost of Sunday Silence is just offscreen (where Cafe is looking), cheering on his/her son/daughter for carrying on the family legacy.

Reminds me of that meme that was going around a few years ago, the one with the "bullying" stock photos that look kinda homoerotic.

I support this Random Background Catgirl agenda.

Are they somehow descended from Sunday Silence and/or Northern Dancer?

They'll need to get to work on those 1000+ children each at some point...

Breasts.

And then there Ikuno Dictus, the legal wife. And the ghost(?) of Sunday Silence. She's just an outright harem protagonist.

Like father like daughter.