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***CUSTOM REQUEST*** It starts with you (my stepmom) coming to sit with me on a bed (or a couch). This is a lot like in "stepMommy's Big Tit Lover" with a woman in her sexual prime and a stepson with the energy to keep up with her. You want to talk to me about the women you've seen me going out with, and how you noticed that they're all on the heavier side with big boobs, bellies, butts, each one looking fatter than the one before. You've never brought it up before, but your recent weight gain has got you seeing how fat is actually really sexy, and the coincidence of my sexual preference is impossible to ignore. Before long you started thinking really inappropriate thoughts and a "hear me out" sort of proposal started taking shape in your head, and now you're here with me, making the case that we should be a couple. You point out we already love each other and we already live together, so it would make sense that we'd be physical too, and you mention how you've learned that I'm into expansion and weight gain kink and that's something you've been curious about but have had no one to try it with. Another reason we're basically in a perfect position to have a relationship. You can tell I'm excited about this idea and that makes you even more excited, so you start getting extra flirtatious with dirty talk about asking me to make stepMommy's big sexy body even fatter and sexier, playing with your breasts and belly, as you fantasize about growing bigger and fatter right here in front of me. In fact... When you were learning more about expansion kink, you came across an ad for a "natural wonder elixir" or something that promised huge and immediate growth with a potent aphrodisiac effect as well. You bring out this supplement and take it, a pill or drink(not actually, unless you want to have a glass of water and pretend it's a potion of some kind). You say it's probably fake but the chance that it might actually make you grow is a huge turn on. You start showing off your body and tell me to picture your body fattening right before my eyes. You start undressing and getting more and more aroused until you tell me you need to fuck me, climbing on top and sliding my cock into your pussy. While you ride me you talk about how every day can be like this, where we have sex while making you bigger and fatter, losing yourself more and more to the pleasure. Relishing in the idea that nobody will have a clue what's going on, to them it just looks like I'm living at home with my stepmom as she puts on more and more weight, having no idea that we're a couple of pervs that get off every day to your growing body. You talk about how big you want to get, excited over the idea of being able to cover my torso with your belly, how your tits, ass, thighs will grow to match, until you look like a hucow milf. Then the thought of breeding sends you over the edge, You ride harder, telling me to come with you, and how you want me to breed you and turn you into my perfect fat milf hucow slut. The more verbose you can be, the better.