I think Risa legitimately does love Yuka, even with everything else. It's probably gonna be messy if Risa and Yuka can't work something out because they have very different (on the surface) wants and needs, but I don't think it's impossible to make it work.
First off we don't know how long these two have been together exactly, but Risa did say she hadn't slept with any men since they got together. Hopefully in the future if she needs something different she can talk it out with Yuka. It's difficult being a polyamorous person in a monogomous relationship but both people's feelings are sincere so some compromises can be made