I’ll be honest. The main reason that I haven’t really done much of that with Ostria and Corona is because I simply haven’t landed on how I want it to go.

As far as I have it figured out, they’ve been childhood friends to some degree to the point of even going to the same college. They’ve experimented together, both sexually and emotionally, and at the very least, they’re important to each other. 

That being said, they aren’t in a traditional “special somepony” relationship together currently. Corona has some feelings for Ostria that she isn’t sure that’s reciprocated, so she tends to bury it with snark and good-natured teasing. She’s attracted to Ostria’s positive nature and her ability to see the good in almost everyone. Also the tiddy.

Corona would probably never admit it to herself consciously, but a lot of her adult life was shaped so she could stay around Ostria, and due to the lawyerpone’s supposed airheadedness, it’s unclear to her whether Ostria realizes this or not. Though it’s not like Corona expects anything, it’s more just that Ostria is basically like her compass.

Corona has some problems with dependency. 

Does Ostria actually feel the same way about Corona? Who knows. She’s always touching and hugging all over Corona, but at the same time, she’s mainly very oriented towards her business. She could just see the physical contact as something that they do because they’ve known each other for so long. She hasn’t brought up the issue.

That’s all I really know right now. Thanks for asking, though, and I’m glad you enjoy the characters beyond the art. It makes me feel good that they stick with someone.