You get up to go to the bathroom, you pass by the living room where Amelia & her little sister where watching TV. You remember the thought that crossed your mind earlier, that if Hifumi was without kids and younger the two of you could of maybe been a couple.
You feel the device in your poket, you don't know if you should mess around with it more. But at the same time, You are certain that no matter what you do with it, no one is going to notice a difference.
You pull out the device and start by making what was once 2 daughters a single daughter.