Cynthia, Liv, Tasha, Sarah, and the other girls are intended to be supporting characters in the individual love interest stories. I don’t have many plans for them beyond their role in advancing the overall plot.
Until now, only Vera was planned to follow a route with her own side story. However, like what happened with Kimberly and Candace, Riley can definitely also have her story developed further.
The reason I wouldn't consider Vera or Riley as love interests is that they won’t have as much focus as the other eight girls. While they will still have their own individual content, it won’t be as in-depth as, for example, Michelle or Julia's storylines.