Dex doesn’t initiate the PolyaTalk because he thinks nursey will break up with him or cheat on him or anything. The way he sees it, sex is a thing that Nursey wants but Dex can’t (or won’t) give him, so it only makes sense for Nursey to find it another place. What Nursey does outside of their relationship won’t make him love Dex any less, it won’t hurt anything, so why not?

So, here’s how it could go

---Dex and nursey mutually agree to date a third together, and nursey and that person have a sexual component to their relationship. All three hold an equal place in the relationship.

---Nursey alone dates a third person and that relationship is romantic and sexual (and so that person and Dex are metamours).

---Nursey has an exclusively sexual, but not romantic, relationships outside of Dex. his could be two things: either one partner in a friends with benefits arrangement, or multiple one-time partners (hookups and one night stands).

I love and support every single one of these options (and i’ve honestly been meaning to write more poly nurseydex, but it never fit into any of the prompts I’ve received)

I think they’d be open to any one of these (and since I’m a multishipper, i deff have ideas for all of these), but the way I see their relationship progressing is beginning with C, with an eventual option for B. Not because dex is against having another partner so that they’re a trio, but because Dex is happily in love with nursey and in love with his relationship with nursey. Whereas Nursey has a lot of love to give and wouldn’t mind multiple romantic partners.

At first, Nursey is really hesitant. Like, he goes along with it because he can see how much Dex wants him to, but he’s unsure. He thinks it’s a concession that Dex is making, that it’s something dex feels like he needs to do for nursey instead of something he wants to do for them both (and for himself). So, nursey goes along with it for Dex but doesn’t actually intend to ever hookup with anyone.

One of their rules is that nursey needs to tell dex if something does happen (i can be after the fact, and a simple ‘hey i hooked up last night with so and so’, just so dex knows what’s going on). For the first few months, dex just kinda waits, but after a while, he’s wondering what’s going on. So, they have the PolyaTalk Pt 2.

It goes very badly.

“I don’t know, baby, i just figure you were giving me permission, but didn’t actually want me to go screw around.”

“By making unilateral decisions about our relationship, decision that go against the things we already discussed and agreed on, you’re basically telling me that you don’t want or care about my input. About our fucking relationship, nurse. And on o;p of that, you just decided that either i lied to you or that you know be better than i know myself, and frankly i’m not sure which i find more insulting. I know you meant well, derek, but honestly what the fuck. Just… I’ll be back, i need to take a walk.”

(dex is working on taking a step back so that he can think and respond instead of reacting and lashing out. Nursey means well, Dex, it’s just hard for our allosexual partners to consider things from all ends)

They do end up working it out in the end.

For partners who Nursey just has sex with, he doesn’t tell them about being in a relationship or about Dex at all. Mostly because they’re not entitled to that information, and also because it means outing Dex to properly explain, and he would never do that to his boyfriend.

After a bit, Nursey gets comfortable with how things are working and tries to pick up someone at a kegster. The guy saw Nursey and dex earlier in the party, and comments on it, so Nursey just kinda “yeah, he’s ace, so…”. “Oh, okay. So it’s just a fake relationship anyway…” and so they summarily banned that guy from ever entering the Haus again.

Once, they ran into one of his one night stands in the middle of the murder Stop-N-Shop, and the person had very strong feelings about cheating, and punched Nursey in the chips aisle. They explained everything once everyone calmed down, and the person was extremely embarrassed.

That was the first person Nursey went on a date with (because nursey found the way they blushed extremely endearing, and he was impressed by the way they could throw a punch even though they were about a foot shorter than Nursey). They were understanding about Dex being ace, and got along with the whole hockey team really well, but in the end decided that they were looking for a monogamous relationship.