Basically how each ones' siblings react to them bringing their date home to meet their siblings
Romantic!Chosen binging someone to meet the rest of the fam
Dark has been waiting for this day a long time
And now it's finally time
Time to activate tease mode
Smug about it
Acts like a normal sibling when they meet their sibling's date
"Hhhheeeeyyyy Choooseeen~ ([insert comment here] it's nighttime here and my brain is jelly)"
She'd probably welcome whoever Chosen is dating because he doesn't trust people easily so that fact that he trusts someone enough to start this kind of relationship is very impressive to her
Second wouldn't be annoying Chosen
He say stuff like "So are you my sister too now?"
Would also welcome said date into the family
Basically Dark would annoy the heck out of Chosen and Second would be welcoming
Dark bringing someone to meet the rest of the fam
Chosen knows Dark could take care of herself so he wouldn't be too harsh
But he would still death glar Dark's date very now and again
Wouldn't trust Dark's date until he released that it could mean he doesn't trust Dark's judgement, but then he remembered the whole Virabot fiasco so he'd stay a bit suspicious of her date
Might eventually warm up the Dark's date
Second would have a similar response to Chosen's date
"Are you my brother now?"
Basically Chosen would be suspicious for a while and Second would be welcoming
Romantic!Second bringing someone to meet the rest of the fam
Chosen is considering all the ways to hide a body
Chosen would n o t trust Second's date no matter how innocent they are/look
"I have killed before, I won't hesitate to do so again"
Dark on the other hand would act around the same as when Chosen brings someone, but she would say "Break his heart, I beak your spine" at least once
Unless Second brought someone shady
Then she would be just as distrustful as Chosen
Basically Chosen is ready to kill an Dark would be cool unless the date was shady, then she'd be with Chosen