Steele x Jaune headcanons for both before and after Volume 3
Steele is treating Jaune as a gopher, making him do some errands for her as both a stress relief and a way to have some fun.
Jaune does it because he thinks Steele is pretty cool and she does train him. He likes Pyrrha but Steele really pushes him to his absolute limits.
Steele is very possessive of Jaune. As far as she is concerned, he is her property and she doesn't take kindly to those who try to take what belongs to her.
They share lots of interests, actually. They both like comics, games and greasy food. Not that Steele doesn't take a chance to tease him about it.
Jaune invites her to the dance. And she enjoys it more than she admits to anyone.
She tries to convince Jaune to go visit his family three days before the Fall of Beacon. He doesn't listen.
She tries to keep him away from the tower. He fights her.
Jaune cries as he swings his sword fruitlesly. He knows Steele could beat him in seconds yet she doesn't. Deep down he hopes she will help him and Pyrrha. She doesn't.
A momentary hesitation and it ends with Steele stabbed through the shoulder.
It's... It's a mess, honestly.
Steele left him with sense of betrayal, abandonment and more than enough of scars across his heart.
Jaune left her with the memories of warmth and love she never knew before, the words of hate and spite he promised to never abandon.