These two are going to morn together in the next avengers. Tony will start blaming himself and getting mad and then he will end with light sobs while talking to Steve about what happened. Then he will embrace Steve will sobing lightly. Then Steve will tell him how sad he is about losing Bucky again. Steve will realize how special the Peter kid is to Tony and will see that sad depressed side of his friend. They will fight this hard feeling of lose together.