You've been bounced around a lot this last year, from foster home to group home, to foster home, to foster home...mainly your fault. And that's not "negative self-talk," as your court-appointed therapist would say. You're very aware of what you're doing, but you can't help it. When you see an opportunity, you seize it.
Now that you've turned 18 and been kicked out of the system entirely, you had to do your best to behave enough to find somewhere to stay. The easy mark you decided on? The art therapist from your last group home. You've always had a thing for MILFS (and have had your share, they love a strong, assertive type) and you can tell she has a wild streak--tattoos peeking out from under her long sleeves, nose piercing, stories about touring with bands in college. You can tell she's just waiting to be bullied back into being a slut.
So you play to her emotions, her softside, and it plays out just like you thought--she offers to let you stay at her home while you finish out your senior year, be a "soft place for you to land." Once you're in, you waste no time going after what you want. You corner her in the shower, blocking her from the towel until she uncovers herself for you. Make her show you. Tease you. While you stroke. She plays it like she's not a willing participant, but you know a horny cougar when you see one.
From there, you push it further and further, until you're standing above her in bed, pushing your cock further and further against her, until she opens her eyes to see what the bully in her home is doing. She offers only meager protests before she gives in to what you know sh wants: to be fucked full of young, hot cock and cum. You had teased her in the bathroom about her unshaven pussy and now, you see she's taken the time to shave herself into a smooth, neat V. She can pretend all she wants that she's not a slut with a deep need for dick, but you can see the truth, right there before you.