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After cumming all over herself, Kim's torso is absolutely covered in her own jizz. She slowly and lazily reaches over for a tissue and begins to wipe herself clean, still feeling loved-up and with a post-orgasmic glow, smiling as she does it and savouring the feeling in her right testicle.
You, meanwhile, are in a bit of a pickle. You're stuck in your own sister's hot, wet ball, which is something you've never spent much time planning for. All you can do is follow the tubes and try to remember the details of your old biology lessons. You remember that there are some long tubes leading from the testicle to the penis, and that there's some cross-over with the urinary system at some point, but you're hazy on the details. You begin climbing through the tubes, hoping to get to the urethra.
Just as you're making your way upwards and dripping with sweat from the heat and exertion, Kim gets up and goes to the bathroom to clean herself up properly. She can feel something stirring down there and enjoys the beautiful tingling sensation, but doesn't pay it much heed as she washes herself off. Just as she begins to dry herself, you make it back to the base of her urethra, deep inside her penis. Kim feels the strange feeling becoming stronger, and it's now too much for her to ignore. Her penis begins to twitch noticeably and she takes hold of it. With you climbing through her urethra, she realises what's happening.
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