What relationship though? Other than a physical attraction to the opposite sex of the same species there really wasn't anything between Hitomi and Jin. She turned Jin down early on, firstly trying to use an excuse, but then she actually told him what she really thought, something he never really recovered from. Sure he had a couple of plans to try pursue her later on, but none of them ever came to fruition. He only imagines them or Hitomi in lewd situation, that's the extent of his feelings for her really. Even when they are alone he still cannot contain himself and still makes Lanka the main topic.
She even gathered her own harem of female beasts and she has deeper relationship with either Hyena or Annie than him. Look back at this chapter Would she ever did any of this if it were Jin? Probably not. You know who would and maybe except saving the p*nis from being ripped off already did? Lanka.
Though this is just a comedy manga, so nothing serious will come out of this, except Hyena falling even more for Hitomi and wanting to become even more of a man for her.