“Why you try to run away from my hug?”
Let's get fluffy! You and Bucky adopt a Golden Retriever (or whatever breed really) puppy and do everything people do with their babies, but with the puppy. You take photos for 1 month, 2 months, 3 months, etc. old, he/she has a stocking at Christmas, birthday parties, the whole deal. Fast forward a couple years and Bucky comes home and the dog goes to greet him carrying a sign saying "Hey Daddy! I'm going to be a big brother/sister!"