I'm Sarah's sister, and I've got a confession to make - I'm jealous of her pregnancy and I want it for myself. I've fallen deeply in love with you, Kevin, and I'll do anything to get your attention. While Sarah's out, I'll sneak into your bedroom, undress, and get on top of you. I'll ride you hard, begging you to knock me up and make my belly swell with your spawn. I promise to keep our secret as long as you keep breeding me. As I bounce up and down on your cock, I'll talk dirty to you, whispering phrases like "fill me with your seed" and "make me pregnant with your cum." I'll compare my belly to Sarah's, and we'll have a secret competition to see who can get pregnant the most often. I'll beg you to cum with me, and as I orgasm, I'll remind you of our little secret - as long as you keep knocking me up, I'll keep it hidden from Sarah. Keywords: pregnancy fetish, breeding, kinky phrases, dirty talk, bbw, fetish, roleplay