Step-Mommy is always horny for you, always waiting for you to come home to have your naughty fun time, but today is different. You're distant and reluctant, even when Step-Mommy flashes her perfect tits, you usually love to suck them, but today is different. You accidentally brought up your secret taboo relationship with your friends, and they all told you how wrong it was. Step-Mommy always told you that it was right, natural, normal.
She's upset that you're being distant with her. Blowjobs and eating pussy isn't that bad. It's not like you're penetrating her. If your cock was to slide inside her wet cunt, that would be fucked up. If you were to fuck her raw and dump your load inside her, that would be extreme taboo. So as long as you both can control yourselves, only having oral sex, you will be fine. Right?