Regina use to be Emma's baby sitter, and Emma had the biggest crush on her. But Regina ended up moving away and lost connection to Emma. It's 10 years later, and they meet again.. and Regina is Emma's professor

Emma Swan has newly made detective at NY PD, her first hardcore assignment is simple, get close to Regina Mills, the head of one of NY's most notorious gangs, gather information, and take her down. To bad her heart has other ideas.

Regina Mills is missing and Emma Swan, A Detective got payed to Find her. What If This Case will change Emma-and Reginas life forever? Emma's G!P

Dr. Mills and Emma Swan. What more can I say?