I was thinking you know, if Natasha would have been a righteous cop. In their first meeting, she didn't need to sexually harass her, but she would have been strict, warning Ashe that doing drugs would put her in jail and sending her off with a warning without any creepiness. Then lets say, Ashe would have seen her doing Gym, impressed by her body. Accidentally they would be together changing clothes when Ashe eyes would drift as she is naked changing her clothes and Natasha would give a charismatic smile saying something like "See something you like" making Ashe blush.
Then her next meeting would be where they get caught with Elysium. But this time she will get angry and ask Ashe to come with her to police station while asking Rachel to ask Evelyn to get her from prison. And while going she stops the car and genuinely asks shy she is involving herself with drugs. Ashe's silence would make her recognize an underlying trauma and then she will give her phone number to meet in civilian clothes in a coffee store.
And in this point of story their romance arc will start. Natasha will empathize with Ashe, then she will advise on better way in dealing with her demons. She will ask her to attend the gym under her training and she would train her, so that she will feel more confident in herself. She can be the primary mentor of Siren's path. Over time, Ashe will fall in love and their romance will blossom and on one night when they would be together in Natasha's house, Ashe will make the first move and at that point Natasha will reveal the Dom Sub role and in a consensual way Ashe will accept her. Ashe will open up to her about her Duplo situation and Natasha will empathize, perhaps revealing that how her own mother was persecuted for that. She will grow more protective of her, teach her how to protect herself, and they could have hot hardcore consensual scenes while Natasha too teaching Ashe how to the perfect Siren.
But nope Stereotypical Rapist Built Cop.