There's already some of that content in the game, like Lenya getting a little bit jealous over the MC/Lily's relationship, when she's out on a quest with him/her insecurities about her breast size.
And in the next v0.04, Lily hears about MC eating out with Violet and also gets a bit jealous.
Though, most of the time they will generally get along.
However, there will be certain characters that really won't get along, and it'll be up to the MC, to figure out how to deal with that/the jealousy that follows.