I saw a prompt on tumblr that I thought I'd post here: Set in season 13, Jack discovers that he has healing abilities when Sam gets seriously hurt.
Like, in a fight, Sam jumps in front of Jack and saves him, but it nearly kills Sam. Dean panics, but there's not really anything he can do. Sam's fading away and Jack (who is horrified that Sam would do that for him, considering that he, himself, if nearly indestructible) kneels next to him despite Dean's protests and instinctively heals Sam. After this, Dean doesn't really mind Jack anymore. Or, you know, something like this. I just stumbled on the prompt and loved it!
Prompt
Like, in a fight, Sam jumps in front of Jack and saves him, but it nearly kills Sam. Dean panics, but there's not really anything he can do. Sam's fading away and Jack (who is horrified that Sam would do that for him, considering that he, himself, if nearly indestructible) kneels next to him despite Dean's protests and instinctively heals Sam. After this, Dean doesn't really mind Jack anymore. Or, you know, something like this. I just stumbled on the prompt and loved it!