You seem unaware of the behind the scenes story regarding Seven's sexuality and her relationship with Raffi. Basically, in the first season, there was no intention to make Seven bisexual, at least not with the writing. The idea came from Jeri Ryan and the actress who played Bijayzal, who decided to play their scenes as though they had romantic history. Then, while filming the final scene in the finale, Jeri Ryan and Michelle Hurd decided on the spot to hold hands suggesting something might develop. That's what led the writers to develop a relationship between the two in season 2.