-First go to Cotton at her cotton candy stand.
-Try to romance her and she will tell you she needs Mimic's permission to romance you.
-go watch the mimic show, guess all her acts correctly(?),at the end of the show Mc will say how he needs Cotton with him to interact with the mimic girl.
-Back to Cotton at her stand and ask her for help with mimic,she will agree and now you get the option to call cotton when watching mimic's play.
-Back to mimic's play and choose the option to call cotton this time,at the end of the show cotton will intervene and tell Mc how he needs to watch mimic's play a few more time to gain her approval.
-Watch her play a few more times ,guess her acts correctly and call cotton again and you should get her approval now.
-Approval acquired so now you can romance cotton,Romance her till you unlock sex(flirt,kiss,hug,give teddy bear etc).
-Choose the sex option with cotton and you will unlock the 3some scene involving MC,Cotton and Mimic
.