I have an idea for your futa Splatoon story. Specifically for Marina's sister that's held in APSL. One of the tests could lead to her ending up in a coma, where she reflects on her life and choices and comes to the conclusion that she just wants to be with her family. You could have her be in a coma for as long as you want, but have her ultimately choose redemption and work hard to earn (y/n)'s trust with no plans for betraying her.