Nox

Now Nox is not one to shy away from the way he feels about things even romantic feelings. However that doesn't mean he doesn't go about it in an awkward way at first. At first he'll try to prove that he's better than all the other people he thinks you like. Or boast about all the things that he's good at. He'll also try proving to you that he can protect and provide for you. Though I think the longer he's on the surface, it mellows out allowing him to mature in that sense. So he'll start showing interest in you by learning about you and the things you like/wanna do.

Now once you get together, he'll want you to wear a collar he had picked out for you. A hard habit he keeps from the underground. Though if you don't really wanna wear something that big he'll get you something smaller like a bracelet or ring. It will however probably have some of his magic infused in it to ward off any monsters with bad intentions. It puts him at ease to know you have something on you when he isn't around all the time.

Dates consist of Nox setting up dates for you to, as cheesy as he thinks it is. He also believes that it shows that he cares because he took the time to set it up, even if it's a date inside. Like a movie night in the living room, with a pallet on the floor and dinner. Or an outside date like a restaurant (though it would be a fancy one since he hates greasy food). He doesn't mind if you wanna set up a date yourself, he is interested to see what you will pick.

I feel like flirting just goes right over his head, he'll probably just look at you confused like what the heck are you on about. So when you wanna show you care or that you love him, it's best to do it with actions. Physical affection does make him blush but he's not afraid to show it back, it shows him that you mean what you're doing. So even with his face full on purple at you holding his hand in public he will return it. Though he probably won't initiate physical affection himself, he shows his affection through acts of service. Just try not to eat his food yet, (he still needs some lessons in what a human can eat).

"DARLING, THE MALEFICENT NOX HAS MADE YOU LUNCH! UH- WHAT DO YOU MEAN ITS NOT SAFE FOR YOU TO EAT?"

Mutt

So with mutt, it's easy for him to tell how he feels about someone, but trust is something different. He has to know for sure he can trust you before he even tries getting with you. Once you earn his trust then he'll easily confess that he likes you. Mutt is not awkward about the way he shows he loves you at all. Constant flirting and touching but if he really wants to show he cares about you, he'll buy you something you've been wanting. Mutt doesn't spend the money he makes just on anyone he's a bit greedy after all. Just like how he starts being greedy over your attention now that you're together.

Same as Nox, Mutt wants you to wear something that has his magic infused with it. Unlike Nox though he doesn't suggest a collar, he'll suggest something he knows you wear often, something you usually have on you. Like a keychain that's on your keys. Though he doesn't usually stray far from you or Nox, it'll help him relax a bit more. However, if you decide you don't want to, he'll just keep a closer SOCKET on you himself.

Dates consist of usually going to muffets or in home dates. Cuddling while he works or maybe trying some little craft you wanted to do with him. One of those guys that doesn't mind trying out those Internet trends with you. Just don't do any of the harsh ones with him, "like pretending to break up with him" trend. After all to monsters they take having an s/o very seriously, so jokes like that aren't really appreciated.

Oh this man knows what flirting is and it's kinda scary at how good he is at it. He'll flirt here and there with you just to get your reaction, to see what you'll do back. Just don't start anything that you can't finish with him~. Mutt loves physical affection, he's usually always subconsciously touching you somewhere. Standing next to him, his hand is on your lower back. Sitting down on the couch, well now his head is in your lap. Isn't afraid to start the physical affection himself, but if you start it yourself, it'll make him even happier. Doesn't know how to cook at all, but at least he knows he's bad at it. So if you depend on him for food it will be take out.

"Hey pup, we still on for our date at muffets? Heard she's got some new pastries in."

Wine

Wine knows exactly how he's feeling, however he wants to know exactly why he's feeling that way. So he takes a while to study you and your reactions to certain things, subtly testing you in certain ways. He needs to know you're in it for the long haul, not just trying stuff out. Wine doesn't show a lot of people his true self or talk about the stuff he's into. So the way he starts showing you that he loves you is by letting you see those pieces of himself that no one else but his brother gets to see. Another reason he tests you is because coffee gets very attached to the people he does actually get to know. So he doesn't want someone that will just stop showing up in their lives.

To wine, collars are a way more into the relationship thing, like marriage level or they are reserved for family members to keep them safe. So he'll try to figure out what you think of them and go from there on the whole proposal part. If he does get you a collar though he'll make sure it matches with what you wear most of the time. That way you can wear it with every outfit without it standing out too much. It makes him very happy to see you wearing it when you do.

Dates with wine are mostly filled with him taking you shopping and spoiling you. He wants you to have the things you want in life and to be as comfortable as you can. Which is why he spoils you the way he does. If you want to do something other than shopping he probably makes a romantic homemade dinner for the two of you. He doesn't trust anyone else's cooking but his own.

Another man that knows what flirting is and he's evil about it. He doesn't do it very often but when he does it'll leave you wanting for more. However if you start it, trust me you'll be the one losing in the end after all you never had a chance to begin with. It's very rare that you ever get Wine to blush or to back down. Wine somehow always knows when and where you want physical affection. You're thinking of wanting your hand held, he already has it in his grasp. You want cuddles he's already holding you.

"LOVE HAVE YOU SEEN MY SEWING KIT? COFFEE TORE ANOTHER HOLE IN HIS HOODIE..."

Coffee

First you've gotta get this guy to want to be around you, he's very anxious around people he doesn't know. So the best way to interact with him at first is to show actual interest in the stuff he likes. He can still tell when people are faking how they feel towards him. It takes a while for him to develop or even realize the feelings that he has but once he does, he'll start acting more shy and fidgety around you. Coffee shows that he loves you by remembering and learning about the stuff you love. He'll draw stuff for you but actually showing you the things he draws is a whole another thing. Just know if you wanna be with him you'll have to deal with wine first, though coffee does defend you against him if he thinks wine is being unreasonable.

Collars? Yeah there is no way coffee is bringing that up to you, he's way too anxious for that. I feel like you would have to be that one to bring it up in your relationship for this one. It's not that he doesn't want it with you, he just has a huge fear of ruining what he already has with you. He also doesn't mind following the customs you have instead of a collar custom he has. He probably would want something else anyways since he already has a collar, which is something he will never take off and two collars might be uncomfortable.

Dates are always inside dates with him, he doesn't like being around people. Most of the time it's playing video games or watching new shows together but every once and a while coffee will try setting up new crafts for you to try together. If you really want an outside date, it'll probably just be a small picnic in the backyard together. Maybe even staying out there long enough to see the sunset.

Coffee understands what flirting is but it usually goes over his head but what he does catch makes him a blushing and shy mess. Him hiding his face in his hoodie while you smirk at him, he doesn't really ever flirt back. Though if he does it's totally by accident, a slip of the tongue if you will. He'll notice right after he says it and hides back into his hoodie. Coffee loves physical attention, you'll have to be the one to ask to start it through since he has a big fear of messing things up. Though he'll never say no to the physical attention you ask to give him.

"D-did you see the n-new game that gam-me out? I-I heard it has some r-really hard bosses i-in it."

I used most of the first few letters from the capital wingdings alphabet, and others are some ASL letters or miscellaneous hand positions.

Of course this is something many skeletons use, including those with injuries or lack of magic letting them speak. it is not a fix all for everyone, but works well enough for many. Given that skeletons are often the ones travelling the multiverse, this language is also incredibly well known across the multiverse.

I have a hc that most sanses (and papyruses often enough) know "hands" or skeleton sign language, coming from their parent gasters that only speak in wingdings or in hands. I also know that Wingdings are not exclusively made out of hand symbols, but i like that idea so I will run with it here.

They learn as children because of the idea that sanses can sometimes see codes, text boxes instead of always just hearing dialogue and stuff like that, kind of like in the way that I think traditional skeleton names are often derived by their fonts that parents can see. Given the only two concrete examples of skeletons are sans and papyrus, it's a limited sample but works well enough.

I hc that even if a skeleton doesn't know the actual signs of skeleton hands, they can often finger spell since the signs used in this version of wingdings would be visual. Even if they don't know the sign language, they would know the visual enough to be able to recall how to handspell themselves.

I also love the idea of hand dialects :D it is a real thing, people who use sign language do make signs in different ways depending on where they are fro/where they learned.

Underfell for example, uses a lot of very sharp but fairly small gestures. they sign higher on the chest as well and have many more crude words in their sign.

Swap/blue uses incredibly large signs with much enthusiasm, and he is a lot faster at signing as well.

Dream and Nightmare use a much more "refined" version of hands, with much older vocabulary and their signs are a lot more graceful, similar to a ballerina and how they keep their hands poised and perfect all the time. theirs has a lot more sweeping motions and gestures.

All of Nightmare's gang bar Cross use the Classic hands, which is much slower and mellower, with signs signed lower on the chest and usually with smaller gestures. Each of their worlds are mutations from the original Undertale, so their sign comes from there as well. Horror and Dust are the best at it, using it more often than Killer, but he knows very well how to understand and sign back.

Cross was discouraged from using hands as a child, even though for him it was often a lot easier than speaking, and he mostly knows what they use on missions and things like commands. His hands is very sharp and precise and to the point, and there are much fewer expressions or larger gestures involved.

Ink never actually learned it since he didn't really come from a typical universe, but he did start learning it eventually pretty passively from Dream and Blue when they wouild occasionally slip into speaking wingdings. He signs a mix of the two, with precise grace but with the absolute wild nature from Blue.

Error often uses signs when he has trouble talking due to his glitches. he also uses a more classic version because he comes from Geno who comes from Classic

Patch often uses signs a lot, though sometimes also struggles with that since he only has one arm. he can fingerspell incredibly fast to compensate and usually it works pretty well and having lived together a long time, Rigel can understand his shorthand most of the time as well. While Patch can technically summon his magic to form the magic to speak and his tongue to form words, he is missing a large section of his jaw, making it incredibly uncomfortable and difficult to speak. he can still however do other noises such as chirring, rattling, and purring like many skeletons and often uses those to communicate minor things as well.