"I'll inform him."

If they don't object, he'll be leaving.

Literally nobody objects to him being farther away from Wei Wuxian. 

Jiang Cheng finally sheathes his sword, hands trembling, then turns to Lan Wangji and bows. "I'm sorry." 

This is very unexpected. He blinks and waits for Jiang Cheng to explain.

"When you first came back, I--I didn't understand why you were angry with me, at first. Even after I heard what happened in the future, I--resented you for it. I didn't understand, I thought--but he was--I don't think I really believed I could end up like that until he showed up and--fuck, he wasn't even sorry."

He takes a deep breath. 

"If I ever turn into that, you have my permission and my blessing to kill me." 

He bows in return. "I will."

"We worked together once. When Wei Ying was missing. We looked for him together. 

If you stay as you are, I will not need to hurt you. That is preferable."

"Thank you." 

"Okay, this is way too depressing. Nobody we care about is going to die, I said that already, I'm not taking it back! Everything bad that happened is going to, instead, not happen, everything's going to be fine. Lan Zhan, if I offer to let Jiang Cheng hold A-Yuan for five minutes are you going to have a qi deviation?"

His opinion of current Jiang Cheng just skyrocketed, but this is still pushing it.

It would be appropriate to agree right away as a gesture of reconciliation. That's the kind of thing that Brother would do. And Wangj is feeling much friendlier towards Jiang Cheng at the moment, but. He mostly does not want anyone but he or Wei Ying or Brother to hold A-Yuan for his entire childhood.

"Why?"

"Because he's A-Yuan's uncle, and he didn't actually do anything wrong." He bounces A-Yuan a little. "...A-Yuan deserves all the aunties and uncles. And we can't give him Wen Qing or Wen Ning or Uncle Four or Granny or anyone." 

This is an unfairly good point.

"Mn." He nods his head in Jiang Cheng's direction by way of permission.

Jiang Cheng takes the baby very, very carefully. 

Oh wow this is kind of a really excellent baby. 

"Hi. I promise not to turn evil and murder your dad. I'll try not to let him fry your mouth with the insane amount of peppers he thinks are appropriate but I can't make any promises there." 

So far this is going pretty well. Wangji approves of both of those commitments. He watches very very carefully, but not aggressively. Mostly. Being aggressive at Jiang Wanyin is a pretty tough habit to break.

Jiang Wanyin does not super want to push his luck and hands the baby back to Lan Wangji after significantly less than five minutes. 

Good. Now baby can resume being cuddled by his dads.

The future Jiang Cheng travels back to Cloud Recesses.  Being unencumbered by a baby, he is much faster.

Does Zewu-jun seem to be around?

Yes he is. 

"I have news about Lan Wangji and Wei Wuxian.  They've decided to elope."

"...How concerned should I be for Wangji?"

"They both seemed enthusiastic with the idea.  And Wei Wuxian is... about as reasonable as he's ever been."  He can't really say that even the Wei Wuxian from this part of time was reasonable.  

"There are other things, though we should move this conversation somewhere private."

"Alright." 

He leads Jiang Cheng inside to a private office. 

Now that he can speak plainly.

"There are at least two futures involved.  Possibly three.  Lan Wangji is from one which either is or resembles mine - Wei Wuxian having been killed by me.  Wei Wuxian is from a future where he survived and Lan Wangji died, and he spent the next several years after that living in the Yiling Burial Mounds in relative peace.  Either he had found a different method of Demonic Cultivation in that timeline that was less damaging to his mind, or not actively using those abilities for a time allowed him to regain his senses."  

There are other possibilities in his mind as well.  Worries that the madness is intermittent and he's merely between bouts; that one day he'll hear a message that Wei Wuxian had snapped and painted whatever town he was in with blood.  Worries that, despite the needless attack on Jin Zixuan and Jiang Yanli he had decided too soon that Wei Wuxian was past the point of saving.  Would the Yiling Patriarch of his timeline have come to his senses?  It wasn't a new thought, of course.  He'd made the decision with the information he had, and the fractional chance he'd given for Wei Wuxian coming home without A-jie had not been enough when weighed against all of the people he was likely to kill if not pushed off of that cliff.  

Seeing one who had reformed still made it feel worse.  

"I haven't seen anything else that indicates someone other than Lan Wangji, Wei Wuxian, and myself have knowledge of the future.

"There is a second me.  The one originally from this time.  He knows - some - of the future events.  The ones Lan Wangji told him, which apparently did not include that Wei Wuxian had gone mad before being killed.  He attacked me when I told him I was from the future.  He's fine - still travelling with them, when I left."  Jiang Cheng is visibly annoyed with his past self.  

He shivers at "and Lan Wangji died."

"I'm very glad that everyone involved seems to be alright." 

"They also have a baby with them.  Wen Ruohan had killed his parents, and they've chosen to adopt him.  It's the same child that both of them adopted in their respective futures.  Given name is Yuan.  At least in my timeline, Lan Wangji had named him Lan Sizhui.  They were still undecided on whose family name the child should have - Wen being obviously no longer acceptable."

"How strange...well. I don't relish telling Uncle, but that at least sounds like a happy piece of news." 

"From what I know, he's a good child."