((I have this head-canon that Mikado can understand Izaya to some degree, if only for the sake of argument))

Acting odd

After the little incident the two had started having some physical contact, mostly hand holding but sometimes Izaya would hug Mikado, the boy hugged back trying to calm the other down, it happened whenever the informant would notice that someone was starting to get too interested in knowing who the head of the dollars was, this happened because he was reminded of that incident, of the fact that he might have been able to do something if he hadn't been so busy dealing with other things, he of course told the ones who asked that he didn't know the identity of the Dollars' leader but he knew word would spread somehow and it scared him. Mikado had some 'out of character' moments as well, as much love as he had for himself, the boy still sometimes doubted his own decisions, Izaya noticed it each time it happened, one of the perks of being so observant as the boy was quite good at hiding it, so to make the other feel better he had to be subtle as to not let the other know he had noticed. The informant will at some point ask Mikado's opinion on something and it will normally go down like this:

"Why are you asking me this? You obviously already made a conclusion yourself" Mikado would say

"Because I like having your insight on things, specially when I have to act carefully, it's not really in my nature to hold back" Izaya would tell him

And once the words left the informant's lips the boy will roll his eyes but answer and once he thought the other wasn't looking, he would smile softly, the informant liked to think the emperor actually knew he was looking

The end... or is it?
Yeah... probably is, or at least it will be as long as I don't get any new ideas for Drabbles with this ship