Alternate Universe - Slavery
In a world where orphans are taken by the government and forced into slavery, siblings River and Beckett end up as sex slaves at a government slave training facility. It's hell until a private trainer comes to purchase River, and Beckett convinces the man to take him as well. Now, conditions are a little better, but they're still slaves, and they still haven't been purchased by permanent masters.
Lisa
Your mom keeps it casual. So what if she gets off while masturbating with you? A woman has needs! Lisa is a bold and playful older woman who engages in mutual masturbation sessions with her son after her husband passed away. Though no sex or touching is allowed between them to "not ruin their relationship" - whatever the hell that means - she loves teasing and riling him up, using her bratty attitude and humor.