I changed a lot of canon to write this... Um, no actual fem!Severus, but they're talking about her.
---
“She’s my best friend since childhood, James! You promised you’d be a little nicer!” Lily stared up at him angrily. “Merlin, she was my Maid of Honor at our wedding!”
“I know, Lily!” James cried, exasperated. “But she’s creeping Sirius out. He’s just not interested.”
“Sirius is a man-slut and you know it.” Lily smoothed a hand over the swollen stomach. “I know she’s not beautiful but would it really hurt him to give her a chance?”
“Yes,” James replied without thinking, before backtracking at the look his wife gave him. “Really, Lils, she’s a Slytherin. You know how well Sirius gets along with Slytherins!”
“Yeah,” the redhead deadpanned. “He hexes before he speaks.”
“It’s not his fault!” James defended his best friend. “His family-”
“Were a lot of prejudiced assholes, and Sirius is proving himself to be not much different!” Lily snarled.
“Lily!”
“No, I’ve had enough of this. We have an Order meeting to get to.”