maybe have them both screw the mc without the other knowing and when they both find out they're screwing him, they tag team him. of course the story wouldnt be as simple as that but thats an idea that came to mind. maybe make each story about what they do on their own, like being a assistant cop to the cop one and it progress slowly because mcs pants slipped off when trying to help her or something, idk about the other one though, maybe have the mc hang out with her at her place in her free time? just silly ideas came through, sorry if its too bland