Brother x sister teens [M4anyone playing female]

I have a very basic idea in mind and if it works out we can be rp partners if you're cool with that. 

The idea is that a brother and a sister are left home alone for a month with enough food left by their parents, because they couldn't get a nanny for their honeymoon anniversary trip. While they are gone, the siblings get increasingly more lewd until it's the nastiest it can be (no scat, vore, gore or that kinda stuff though). 

I can either be your older brother or younger or the rp can be more romantic or more lewd, we can discuss it more.