In my ideal world, IF Bechloe get together in PP3...
I want Aubrey to be the instigator.
Like, she notices Beca’s toner for Chloe or something.
Calls her out on it.
Eventually she tells Beca that Chloe likes her. Always has.
And she gives Beca some odd Aubrey-esque ‘best friend permission’ to tell Chloe how she feels because she wants Chloe to be happy and knows Beca can make Chloe happy.
Bonus: Aubrey secretly (or openly) hates Chicago..