The Doctor and Seven to some might not be such an obvious couple, but the producers just as they do with Janeway and Chakotay, hint at the possibility of a relationship. and have even gone as far as letting us know the Doctor is in Love with Seven, his puple in the art of humanity.
The Doctor has given Seven leasons on things from humor and manors to dancing, dating, love and romance. he's helpped her through some really rough patches and even worked with her to save the crew once or twice.
Seven for her part has sang duets with the Doctor and even been to a party with him being held in honor of a guest on Voyager. and has shown her thanks once or twice with a kiss on the cheek.
Quotes
Just the one for now!!!
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Doctor: You're a woman Seven.
Seven: Is that an observation or a diagnosis?
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Best Episode