It's about headcanons, I guess...

Helion'd always been Feyre's safe harbor. Even when they're friends, Feyre could feel a conection with Helion; it wasn't a bond like the mating bond, but something similar. It was easy for them to talk, to laugh, to do silly things together. They complete each other and, even thought Helion thinks Feyre to be a busybody, he would appreciate how fiery and sweet she can be.

When Feyre discovered that Helion is also a painter, things got more interesting for her. She used the art to get more closer to him. They still spend time painting together when before it was just a way to make Helion fall in love with her.

Yess!! I can see that too. Like; Feysand arrives and Feyre's attention goes all on LoA with her fiery curly hair and the freckles all over her face and those lips gleaming. My Feyre is a sucker for my LoA. Meanwhile Rhys is rolling his eyes to Helion even though a smile is printed on his face; he cannot hold it, they'd lived a lot and everybody was happy; Feyre being all silly and in love was something good to see and Rhys has the pleasure to see and feel that too. And don't even let me start with Helion; to have LoA with him is already a paradise, but now he has Feyre and Rhys? My sunny boy is shining like a star. And LoA.... She feels that she's finally living, finally free to do whatever she wants and to have Feyre and Helion with her is a proof of it. Even Rhys' face is more tolerable (jk, they have a good relationship ok?)

Also, I can see Feysand having multiple dates with EVERY DAMNED COUPLE. Nessian mostly.

But a triple date between Feysand x Nessian x Elucien is something like: Rhys and Lucien discussing about historical or sportive things while Nesta is paying attention and trying to argue with them, even though she knows nothing about this rebellion that happened 9 centuries ago. Elain sometimes would pay attention to them, but mostly her mate and how sexy he is while serious. And then we have Cassian and Feyre, drinking and laughing like teenagers, Cassian mimicing Rhys and Feyre mimicing Lucien. Elain would catch them doing it and laugh, saying that Feyre is mimicing him wrong. In the end of the date they're all a little bit tired and start enjoy their own mates presence. Nessian is the first to leave and Feysand follow them. Elucien would stay a little bit more and then go home.

Ok I can't see Elucien having a d.d with Jassa and tbh with anyone. I feel that these Elucien's dates where they go to nature (forest, fields, beaches, etc) is more intimate and romantic, no room for another couple (and I can't see elucien as poly, idk why they just don't?). But a karaoke competition between Elucien x Jassa? You're calling the right people.

And Rhycien in canon universe I can't see them having double date, but in a morden au or something like that.... Call Rhycien and Emorie, they'd rock; the queer table with the most stylish and beautiful people in all world, they're all laughing about everything, like really they're the most silly.