Your dumb step sister comes home after a long day of work, sitting across from you. She tells you she's in a bit of a sticky situation. She says she has been taking some random supplements that she found online to help her boobs grow. She said they've been growing because they're full of milk! The pills were made to make women lactate! She unzips her jacket and reveals that she has leaked through her shirt. She asks for a weird favor. Reluctantly, she asks you to please suckle the milk out of her boobs to help relieve her engorgement. After a breastfeeding session, she goes to move you to her opposite boob and sees that your cock is rock hard! She is weirded out and pissed off that YOU'RE the one making this weird, but you couldn't help it. You tell her you want to watch her masturbate. She declines quickly. You tell her you won't keep helping her unless she puts on a show, so you guys make an agreement. You get to watch her masturbate until you cum, and then you'll help her with her "problem". She's such a brat, but agrees to play with herself for you if you keep helping her empty her breasts from now on. Maybe if you're lucky you can take tomorrow's arrangement to the next level...