One great fanfiction is 'The Unspoken Bond'. It delves deep into the relationship between Aaron Hotchner and Emily Prentiss, exploring their mutual respect and how they support each other during tough cases. The story is well - written, with great character development that stays true to their personalities from the show.
A third option is 'The Protective Duo'. It shows how Hotchner and Prentiss are always looking out for each other. The story is filled with heartwarming scenes as well as some intense action sequences. It's a great read for fans who love to see their relationship explored in different scenarios.