It's more important to get her attached to her new underage harem. Make her completely dependent on them for both sexual pleasure and food and water which they will have to suck out of their mouths, as she is still tied up. Make sure she gets no sodium in her food, which means that she will need to swallow her little brother's cum to survive.
Then give her a set of hormones cause her to lactate. Not having the milk taken out causes pain, so she'll need to have it drained by the lolis. She won't hurt the kids, being a moralfag, so oral sex is easy.
Loosen her bonds while she sleeps and leave a gun on the counter. Have her shoot you, though make sure you send incriminating images to the police and to leave a note to let her know you've done this. SHe will flee with the children in a car you've provided, traveling the country, evading the police and knowing what she has become, live in total moral defeat, especially considering that killing herself would leave the children in danger. Being an ex-moral fag, she will hopefully not decide to mercy kill them, either.