Hi everyone, thanks for the support and the great advice, I read all your messages

There are some really good ideas!
An idea I had was for the MC to have a confidante. Someone you can mind control into being okay with, and maybe even turned on by all the mind control. Not just the mind control you have on your selected confidante, but the control you have on others.
And since the sister already wants to be your confidante on your sexcapades, she'd seems like a good choice. She'd also get the most benefits from it because any girls you control can be shared with her.
Plus, you get the most access to the sister since you live together, so more opportunities to fine-tune your control over her.
As for the mom, an idea I had was make her okay with whoever hers kids have sex with. This would make her okay with you inviting girls over, your sister being gay, you and your sister hooking up with eachother, and your mom being okay with her kids hooking up with her.
Just a bunch of tips for the tip jar.