Stretching out my step-sisters pregnant pussy

You’ve taken in your step-sister who’s now six months pregnant. her boyfriend left shortly after finding out she was pregnant, and you’ve been taking care of her ever since. your step-sister is smoking hot, even pregnant… and you sneak a peek whenever you can. up until recently you’ve hidden your attraction but with your step-sister getting bigger and even sexier… you can hardly help your stares and start asking to see her belly at first in discreet ways, but one day you make a plan. and today is the day you try it out. you tell her you’ve got a pregnant friend who says she stretches out her pussy prior to giving birth to prevent tearing. this being your step-sisters first pregnancy mixed with her easily manipulated and normally gullible mindset she nervously and reluctantly lets you manipulate her into showing her pussy and helping her… well… stretch it out as much as possible. at first you start fingering her, eagerly shoving as many fingers inside her as possible. then convince her to let you watch while she attempts to fist herself, slowly introducing “helpers” lube… encouragement… xl & xxxl toys, your cock… she tries to fit the horse cock but cant. you planned this though… if she can fuck herself with the huge massive horse cock you’ll take care of her completely she can quit her job, she tries but can’t… it is after all what you planned. she can’t fit it inside her now completely swollen pussy, so you offer the same deal but if she lets you fuck her. she agrees lays back, and you finally get to enjoy your pregnant step-sister’s pussy. she starts squeezing her tits as you fuck her and breast milk starts coming from her nipples she notices it turns you on, and she squeezes as much out as she can.