They're in a polycule that only works because Toby and Jeff haven't realised that's the case.

Jack is going to save himself the headache and let them figure that out themselves.

Jack and Toby

Toby and Jack are the ones in a more typical romantic/sexual relationship. PDA, confessions of love, casual references to their relationship all that.

They are generally very sweet on each other.

Toby regularly makes puns with Jack's name, the most common is when Jack is doing literally anything and he'll pop his head in and say something along the lines of "I guess you're a Jack of all trades"

This is so common that Jack will make the pun himself if he sees Toby coming.

Jeff is the only one bothered by the shitty pun, it's the 'we consent, I don't' meme.

They met in the middle of a bloodbath. Jack had left the hunger too long, needed more than just the kidneys the body could give. When rationality prevailed, in a sea of corpses with carved out torsos. Stood a man with a hatchet over his shoulder. Silence. Then a question. Then a conversation.

After that the two seemed to run into each other more and more.

Toby is generally unsure of how to deal with Jack's hunger. He once offered for Jack to eat pieces of his flesh since he can't feel it anyway, this was immediately shut down.

Jack doesn't know if the incomplete piece of a demon he has in him is why he's able to avoid the sickness and therefore Toby's own demonic entity, but he tends to avoid thinking about it to much.

Toby was the first to confess his love, he realised that he doesn't have much of a social life anymore and he's not going to hit the milestones most people do. So he admitted he loved Jack the moment the thought crossed his mind.

Jack made it clear that although he didn't quite feel the same at that point he still cared for Toby. Jack finally confessed when Toby swung by the safe house with a tupperware of kidneys from a fresh kill.

Toby told Jack he was trans during a rather heartfelt conversation about where they thought their lives were going. Jack doesn't know Toby's deadname because he never asked and never will, it really does not matter to him.

Toby can feel physical affection so he likes the close proximity and he so hangs off of Jack at any and all chances.

Jack uses Toby as a headrest when they're both standing.

Jack is still careful when tending to Toby's wounds, because although the other can't feel it Jack doesn't want to make it seem as if he's apathetic to the injuries.

Jack and Jeff

Jeff and Jack, on the other hand, are in a queer platonic relationship. Neither of them use that term or have the language to actually vocalise it, but neither can see themselves living their lives apart.

They both want each other's companionship. And love each other in a fully non-romantic way. Both have come to the unspoken agreement that they are spending whatever life they have together.

However Jack has never been said anything even remotely similar to "I love you" to Jeff as he fears that Jeff will see it as romantic. Jack is 100% correct in this assumption, Jeff has not realises he's aromantic.

Jeff has realised that his care for Jack isn't romantic, it's not sexual, it is platonic, hasn't yet come to the conclusion that it's love. (He has the emotional intelligence of a gnat and the self awareness of a someone who never had to face court for murdering his family.)

However there was a single time the two got their wires crossed.

Jeff was on death's door, his injuries near fatal. Jack pulled out every trick he had and even asked the demon for some sort of help. During the recovery period the two experienced the general intimacy of such a traumatic moment. They kissed, had sex and then didn't speak to each other for days. Jeff was embarrassed, Jack didn't know what to say. That silence was broken after Jeff drunkenly announced he didn't want to have sex with Jack again. They went back to normal and that was never spoken about again.

Despite the order I'm writing these in, Jeff and Jack met first.

Jeff needed a place to hide and a cabin in the woods was a good a place as any. Jack came home. It escalated to blows after Jack confessed to the whole cannibalism thing.

Jeff offered his kidney as a truce, Jack declined. Jeff didn't realise the whole party possessed by a demon thing was actually real until Jack tagged along on a kill and Jeff saw him rip a kidney out and eat it.

Jeff is not even the slightest bit worried about Jack's hunger and treats it like a joke, regularly telling Jack to just eat him at minor disagreements.

Jack hates this because unlike Toby, Jeff is a messy killer and blood tempts the hunger, his greatest fear is waking up on top of Jeff's corpse, he'll never admit to this.

Jack is careful with Jeff's injuries, he has to be, any distractions could lead to disaster. He's almost completely silent. Afterwards he'll tell Jeff that next time he'll won't help. They both know this is a lie.

Jeff and Toby

Unfortunately for Toby, Jeff was apart of the agreement when it came to dating Jack.

Unfortunately for Jeff, Jack didn't tell him that he was dating Toby until he walked into his home to the sound of sex.

The two did not get along at first and regularly fought over all the dumb shit they could think of.

Toby didn't understand why Jeff was such a fucking asshole.

Jeff didn't understand how Jack could date someone without a spine.

The first time they got into a physical fight, Jack didn't bother patching either of them up and told them he wasn't getting involved, they needed to sort whatever this was out.

Things changed between them when Jeff hit Toby and Toby responded with a "I can't feel it but I know you somehow can't even hit as hard as my father." This led to them opening up to each other, and they bonded over how fucked up their lives were in some way.

Jeff was the first to experience the Slender Sickness.

Toby was mortified, he all but ran to find Slender, he begged for the entity to relent. He spilled his guts about everything he had been up to. It was the first he had cried since he was taken.

Slender realised that this could damage his image in Toby's eyes and could lead to further issues, so released Jeff from the sickness.

Slender is also interested in observing the relationship between Jeff and Jack since it's not one he has encountered before, and letting Toby date Jack accomplishes that.

Much like his lack of fear of Jack's hunger, Jeff generally over estimates his abilities, has delusions of grandeur and thinks that if it really came down to it he could kill Slenderman with his bare hands. Jeff is wrong. Toby hopes he never has to see how wrong.

The two still tend to get into physical fights to blow off steam.

Jeff found found out Toby was trans because a binder was left around. Jeff saw it and being the menace to other people he is, decided to just put it on??? Realised that the pressure on his chest is actually kind of nice?? Jack and Toby came back, Toby demanded his shit back and Jeff refused unless he was given a reason. Jeff does not care but still refuses to give the binder back, he sometimes wears it when he feels overwhelmed and refuses to unpack that.

It's just platonic between these two.

All Three

When it comes to intimacy, it usually comes in the form of licking each other's wounds.

There's always a first aid kit and if someone comes home, then whoever is there will help, this has never been argued.

Jack has seen both Toby and Jeff naked.

Jeff has seen both Jack and Toby naked.

Toby has only seen Jack naked.

Jeff regularly teases the two when he hears them having sex, he's generally apathetic to it, and usually drowns it out. Jack doesn't mind because it seems trivial compared the situation they're in. Toby is mortified each time it happens.

Toby used to insist that Jack and he only had sex when Jeff was out. However he realise that Jeff copying his moans was bad, but Jeff coming back in middle of it, covered in so much blood it's hard to tell where he's bleeding from, and Jack tending to Jeff's wounds completely naked was so much worse. This has happened at least twice.

Toby feels a general guilt about knowing their lives are constantly being spied on. Jack knows his own demon is enough to keep Slender out of his head, and Jeff like stated before, wrongly believes he can fight him if anything comes up.

It is never acknowledged, but ending up laying on each other in various combinations is very common.

Anyway thanks for reading, and if this is cringe I don't particular care, I've killed the part of me that cringes a long time ago and you should too.