Hope we get Ian x Ivy next update
I feel that the interconnected two-protagonist design is simply unbalanced. Lena's choices dont have weight to them, since no guy rejects her. She can treat anyone like shit and still have her way as long as she promises sex. Ian's choices are very rigid, you cannot maintain multiple relationships as most of the girls he meets are monogamous / jealous and you usually end up losing points with someone in every choice. With Lena, you can be on almost every character path at the same time. Lena can be with Ian, Robert, the DJ dude, Axel, Seymour and Jeremy at the same time without any content locking. Ian himself only has 2 customization options (red or blue shirt) while Lena has 5 outfits (ignoring piercings).
Also, Lena's choices mostly boil down to sex, with very little character development. Most of the guys are chads who only care for sex (except Axel, I guess). On the other hand, you see Ian's relationships being developed with Alsion / Cherry / Holly / Lena / Cindy. I kinda felt sorry for Dave and Perry on Cindy and Cherry paths, as the game does well to make them feel as your friends. I would have no issues backstabbing Ivy with Lena though.