A very quick Harry Potter headcanon
Lily and Snape meeting very briefly during a fight, and he grabs her arm and drags her to a dark corner in order to try and speak to her away from James. But unfortunately, she's faster now and less likely to deal with the shit life has handed her than she was at 15. She's not even 20 and has lost her parents and many loved ones to a war she shouldn't be fighting.
So she pulls out her wand, points it at him.
"You have chosen your side, and I have chosen mine. Come near me again and I will not be as lenient" She tells him, and he knows she means it because of the fire in her eyes and the tone of her voice. So he releases her and she punches him hard enough to break his nose.
The next time Snape hears about Lily is her wedding announcement.













