Your lesbian sister and her girlfriend have decided they want to have a bb, but soon realize IVF and adoption are super expensive! So your sister comes up with an idea - you could be the one to impregnate her. She's a bit nervous ask you, but you agree with a little convincing (she says she'll even let you watch her and her girlfriend lick eachothers pussies). Relieved and excited she tells you that it needs to be done right now because she's at her most fertile. She's even brought over her old schoolgirl uniform from when you two were younger because she remembers you staring at her when she'd wear it around the house. Hastily, she changes into it and pulls out your cock to start getting you nice and hard. She wants to fill your balls up with as much cum as possible so you can shoot it deep inside her lesbian pussy and get her pregnant. She begins to ride you (cowgirl and reverse cowgirl) and comments on how long it's been since she's had a cock and how good it feels inside her. She tells you that if she'd known how good your cock felt she would have started fucking you a long time ago. Soon your older sister is squirting all over your cock, moaning and gasping and begging you to fill her with your cum. Finally, you both climax and you fill her up just like she wanted to. She tells you how good it feels to be filled with her brother's jizz and tells you there's a possibility you might need to try a few more times before she finally conceives. Next time she'll bring her girlfriend!
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