the_debt_of_time

After Sirius's attack on Regulus, the pack had sat down and decided that, unless he
was using it for classes, he would relinquish his wand to James, at least until Sirius himself
felt that he could look at a Slytherin without wanting to attack.
Mia smirked at her brother. "He looks more like a Chaser to me. Go ahead. I'm
going to wait around for Lily. You two save us seats," she requested, thinking that the
library would certainly be packed with their fellow seventh years who were all preparing
for N.E.W.T.s.
Sirius nodded and kissed her cheek before heading out the door, dropping his wand
into James's palm.
Mia turned around and looked at Snape, who was sealing up a dozen phials of
Pepper-Up Potion. After her brief conversation with Regulus, Mia was realising how many
years she had spent in this timeline being angry about the future. It had taken being
confronted by a vision of herself, a slew of Arithmancy calculations, and a trip with Remus
inside of a Pensieve to see that she had wasted too much time being bitter instead of doing
what Future Remus's letter had instructed her to do. She really was not living her life if she
was focused on the future and what was meant to be.
A great portion of that wasted focus had been spent being angry at the wizard in
front of her. Angry at him for pushing her to the ground and sparking the feud between
himself and James. Angry at him for being terrible to Lily, for being mean to her, for hexing
James and Sirius, and for never standing up for his friend. She was also angry in knowing
that it was Severus Snape who would hear and then relay the prophecy about Harry to
Voldemort, ultimately putting targets on James, Lily, Alice, and Frank's backs. But her
anger did not stop there. She was furious that he had brought his bitter past into the future
with him, taking his rivalry with James into another generation by being so publicly cruel
to Harry. It also did not help that he had called her an insufferable know-it-all and made
fun of her teeth after she had been hexed—the arsehole.
But if she could bring herself to see the path to Regulus's redemption, and
forgive Draco for tormenting her for years, then surely she could somehow figure out how
to remember that Severus Snape would one day be essential to ending the war. He would
provide them not only with the Sword of Gryffindor and assist in their infiltration of the
school, but he would protect the students of Hogwarts from being completely manhandled