Imagine you and Loki celebrating your daughter’s first birthday. You and him are no longer together, because of his mischievous ways. But, that all changes when he realizes that out of all the women he has dated, you are his true love. Once you have put your daughter in her crib for the night, Loki kisses you and asks you to forgive him for all he has done to you. The moment you nod, he picks you up and throws you over his shoulder and says “Let’s make another one!“
Baby headcanon: I think Bucky would be scared of hurting the baby at first and not want to hold it because "I've hurt people before", but Steve would be busy or have to go and save the world and be like take the infant and Bucky's heart just melts.