Age Difference Coercion

Hey there! I currently have a bit of a craving that may not be to everyone's taste. I'm looking to play a female figure, aka Sister, Neighbor, Cousin, etc. into a younger male (Or younger futa, if you want). I'm thinking maybe my character is 16-18 and babysitting, meanwhile your character(s) is between 10-13. I'm hoping for it to be dub-con, like maybe your character threatens to tell their parents something if my character doesn't act as their slave. Mind you this is a very bare bones idea, and there is plenty of room for editing and brainstorming!

I don't mind if genital size is larger than would be normal for those ages, it's just a rp after all.