A/N: So I hope it's okay, but I went with slightly older kids, mostly preteenish, because those kind of rooms are more aesthetically pleasing than nurseries.
Steve:
You and Steve ended up having two kids, the older one a girl and the younger kid a boy. A little while back Steve went all "dad project" on the house (with Clint's assistance) and redid both kids rooms to match their dream rooms.
Bucky:
Your son's room is pretty cute, with a nice four poster bed and a chair by the bed. The chair is mainly used by Bucky so that he can read bedtime stories to your son every night.
Pietro:
The two of you ended up having a daughter and even though she doesn't have the biggest bedroom in the world she makes really good use of the space and is quite well organized.
YOU ARE READING
Avengers Preferences
RandomPreferences for Steve, Bucky, Pietro, Loki, Clint, Thor, Tony, Natasha and Wanda *Sorry I didn't do them for Bruce. I was having a particularly hard time writing for/about him and I didn't think I could do him justice.