Chakotay & Seven are like Demi Moore & Ashton Kutcher.
You know they're together but you're not exactly sure why.
Meh, Demi fell for Ashton because he's young and gorgeous, and Ashton fell for Demi probably because she was his pubertal fantasy.
But why would Seven fall for a guy with a probable secret crush on his captan, who likely had a latent girlcrush on her?
As a Borg, Seven was made to respect a chain of authority.
Chakotay is First Officer, thus the Alpha Male on Voyager.
His rank to Seven would give him appeal.
Mach 5, Ashton is young and gorgeous? I was thinking more like doofy & talentless. Demi has the money, being an actress/producer. He just riding her coat tails. Can you say: Male J-Lo?