it's based on a Quotev Fanfiction called "Millie Fitzsimmons x reader shite" by Candy Acid, I recommend reading it! (I'd give the link,but all that copies is the Quotev website)

Now,Millie wasn't a fan of celebrating Christmas...to be honest,she didn't like it at all

BUT THEN you happened

You comforted her after she saw that asshole Dylan kissing that bitch Brooke, spent time with her and became her friend!

Currently you're after the Christmas Eve dinner at her grandpa's house in her room,while the others(your parents,her aunt and uncle,her grandpa and her cousins) are downstairs,chatting,getting along, etcetera etcetera

"Man,I haven't listened to him in years!" You say,pointing at the Curt Carrion poster on her wall. You noticed her rummaging through her drawer...

...she either didn't hear you,forgot to answer out loud,or ignored your question,most likely the second one since when you sat on her bed she replied

"Oh,yeah,I love Curt Carrion. I have too many songs I love from him..."