Not Forgotten (http://archiveofourown.org/works/545905), here you go. The concept and execution is actually rather well done, even if I wish I had paid enough attention to know not to read it at work. I think there's a new chapter up since I read it but I NEED my porn to be in character for me to want to read it? But I might give it another go anyway in the hopes that Emma and Regina do quickly locate and make good use of Emma's clitoris.