Peter has a nasty habit of falling. And Tony, bless him, will catch him every. single. time. Until the day he can't.

"Why on earth do you think we're qualified to watch your brother?" Thor shrugged. "You two are already watching Sergeant Barnes, so you obviously have some experience with ex homicidal maniacs." Natasha sighed. "You don't know what you're asking." Steve agreed. "Thor, as much as we would love to help you, we just can't." "Please." Thor begged. "You're Loki's only hope."