If you are aware of how OMEGAVERSE works, you'll actually understand why Minju might come as 'abusive' and 'creepy' (hint: she's actually not). It was because when Omegas are in heat, they go through extreme pain and have to be touched and have a release with the help of Alphas or Betas (aka have s e x). During heat, Omegas release pheromones or a type of scent which have a huge effect on Alphas and urge them to make love to that Omega, the same effect happens to Omegas as well, Alpha's pheromones when in heat can turn them on. Notice how at one of the latest chapter, Minju felt that her heat was close so she chose to stay away from Hayoon because she thought Hayoon hated her so she wanted to avoid 'genetically' forcing the latter to get turned on as well.
Again, MINJU ISN"T ABUSIVE! Hayoon is in pain whenever she's in heat, Minju helps her have a release so she'll not be in that state. Notice how Minju didn't even tend to her own needs (intercourse) much until the later chapters, she mainly just tended to Hayoon's.