This is a tough question bcs the polycule vibes are extreme with en- lmfaoo. It's almost like I can't pinpoint who'd fuck first bcs everyone has some sort of tension going on.
If it were all 7 of them locked together the first to end up would definitely be hccjek. I've no doubts about that one. It's like they're both waiting to get detained within an enclosed space just so the tension could rise in the air and they could excuse their sexual activity for simply being forced proximity. If given the chance, Hs could literally jump on anyone. I'm convinced he's just waiting for the right moment to pounce. (His first choices would probably be jek and kiki though).
Another duo I think would thrive off of being watched/detained are jekwcn... Are we surprised?
Those freaksters would not give a single fuck. Jek would probably initiate, Won would take the bait easily. It's a very simple dance when it comes to the two of them really, despite them lacking in popularity. I believe you need to be a real freak in order to recognize that puppy and kitty would fuck for days if given the opportunity to. They don't care that the others are watching. Won is feeding the sick thoughts of "sn hyung probably thinks I'm a whore, hs hyung is getting off to this, jy hyung is peeking through his fingers" and jek's are "rk probably wants to be in won's place, sh wonders when he'd ever have the guts to do this, sn is getting off to the idea of won being put in his place."
(They are all insane)
(The next to fuck after this are probably hccki...but that's because kiki has fomo and can't accept that won is being serviced and he isn't. Jealousy? Maybe idk.)

Anon you're reading my mind I've been thinking of svnyvnki so much lately...
Their dynamics are so entertaining if we look at it from the lens of kiki being the youngest and looking up to both of them but in different ways...
Him going to jek for play, fun, joking around and then going to sun for comfort, softness and encouragement.
The one pulling the reins would be sun, no? He loves both jek and kiki a lot and it's rlly heartwarming i cant even be that nsfw when im talking abt them jdsjsjs
It's like wow kiki knows he can get different things from both of them so he's being a good boy so they indulge him and spoil him lots.
Svnjek is like sooo peak the way jek loves sun in a warm comfortable way and then u add kiki into the mix and it's like...wow these omegas are all nesting together sjsnddnd
Idk my mind is kinda blank I'll have to cook up some svnyvnki to make it up to you anon. Bottom line is i love them lots they r very soft (sfw) and also rlly freaked out (nsfw) when need be. Kiki is so eager to please I can imagine him being so pouty when he doesn't get what he wants. Then they tease him by making him watch and not touch aweee so baby alpha learns his lesson.
They can be a little toxic with him tho bcs they love how desperate kiki gets. And svnjek are kinda freak4freak theyre insane poor baby alpha has no idea what he got himself into... cute.

Artemis your mind... I'm thinking hccki oops... Kiki just freshly getting that tattoo done and it still stinging when touched but he still works his way around it and trims himself all smooth and proper so he can send his hyungie a little pic he can keep for himself.
Kiki is sitting on the couch one day while hccjek bicker over a game on the playstation and he's being super coy, sends it to hcc just as they're about to start a new round (of wtvr the fuck theyre playing idk). Hcc lifts his phone and instantly goes red in the face. Jek is super curious so he's like heyyy what r u looking at and hcc nearly throws the phone across the room trying to get jek to back off.
It's a cute pic okay? Baby alpha tried rlly hard to get both his tattoo and his cute pink cock in frame. His fingers are wrapped around it loosely and he has rings on each one, gleaming silver and hcc is like "fuck i got him those rings."
+ Bonus points if you hc him as having a bellybutton piercing too (and i fucking LOVEEEE bellybutton piercing kiki).
It ends with hcc's fingers digging into the skin of kiki's hips as he bucks into him like a wild animal...poor kiki can't breathe, can't speak. He's just falling apart on it and it's exactly what he wanted to achieve by sending that pic.