Tony and Peter
I'm looking for a fic I read in which Peter is still around and Tony can hear him but not see him. Tony thinks he is going insane, but then Peter moves a paper on Tony's desk and Friday confirms that something moved it. Then Tony starts coming up with a way to prove Peter is still here. He makes something so he can see Peter when he is around. Peter isn't always there and describes that he is with other people when he's not with Tony, but doesn't know where he is exactly. Sound familiar to anyone?
Also looking for a different fic in which Peter comes back from the ash and dust after Thanos gets rid of everyone. The Avengers fix it and Peter comes back but is having some serious PTSD and is trying to hide it from everyone.
On a side note — if anyone has any good Tony and Peter fics for post-infinity war, I would love them. Not as a couple, but with Tony looking out for Peter and/or treating him like a son. I like the dynamic in which Tony loves Peter like he would a son. Thanks in advance!