What we got:

these lanterns seem familiar...🤔🤔🤔 Edit : I might be wrong but I saw them in Shiemi's shop :O

Step 1 : have a baby with Satan

Step 2 :

Hello Anon! And no worries, it’s fine, it took me a while to get it as well, but at least now I think I can explain. :))

First of all, Rin realizing the chaos that his birth led to almost made him lose it:

However, Mephy controlled his outburst and…

…sent him away “to cool his head”. 

The thing is, during the whole scene Mephy is a bit pissed at Rin for almost going full Satan 2.0, since it made Rin’s demon heart out in the open for every other demon around during this time era to feel/notice. 

Because demons can feel each other’s presence and powers:

…so, technically, as a half demon and as Satan’s son, Rin should be noticeable too, even while in the past.

Therefore, so that no demon from the past will realize who Rin is, Mephy most likely created that “otherdimensional space” he mentioned to him. It hides Rin’s true nature to the rest of his kind…

…as long as Rin keeps control over himself and doesn’t flash his demon heart, which is what happened in ch109. 

I mean, I’m sure it would be bad for Mephy’s plans if Lucifer or Satan realized that Rin is journeying through the past and, since Rin doesn’t have full control over his own powers, Mephy probably had no other choice.

I hope it answers your question? By the way, one thing I found very interesting during the whole scene is that…

…Rin is apparently getting strong enough to destroy some of the King of Time’s work. And since Mephy is supposedly the chessmaster, his own wild card becoming more powerful than him is something to look forward to. :)))

FUCKFUCKFUCKFUCKFUCKFUCK

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