Well, both Othra and Roushk are savior complexes for the most part. Othra develops affection for you after how much you helped her save her people when she doubted herself, not to mention saving Roushk. Roushk still has lingering effects from the lust state he was in and if you lost to him during that state he kind of remembers bits of what he did with you iirc, which affects him a bit as well as being thankful for how much you've helped Othra and his people.
At the celebration you get the option to say if you have feelings for one or both of them and get the coresponding love point and as long as you selected one you can change your mind before the sex scene after the tower by telling the other to stay too. You do have a chance to kiss Othra but there are no sex scenes with her as they were never added to the game, as with most of the stuff they start and never add to. It's even coded out to have a both scene and a just Othra scene, but all that was made was Roushk's.
While most of the time i'd be fine with only getting the male scenes, their relationship and story is one where i actually wanted the scene with both of them and usually do select having feelings for both since it doesn't really take any content away. Stuff like that is why i haven't played the game in a while as he just keeps adding new areas and giving you new guys to lust over only to move on to the next new area before you even get scenes for half of them it feels like. Honestly someone needs to just go back and focus on adding all of his skipped content while he focuses on 'progressing the story' if that is even still happening. At this point it's just a game of 'yes, let's start dating.' before you up and run away to the next zone while he's just left wondering where his new boyfriend is before you even had a first date.