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Big bro who gets his little sister a stuffed unicorn because they're her favorite.
The two of them are at home relaxing and she won't let go of the unicorn.
He takes the stuffie and makes it act like it's peeking up her skirt.
He starts to rub the horn against her through her panties and she realizes how good it feels.
He keeps doing it, it's a little stiff, but the fabric is different. It feels good when he pulls her panties to the side and rubs the horn against her bare pussy, scissoring it against her swollen clit, circling it around her aching entrance.
It's only a couple inches short, but it feels so good sliding into her pussy.
He fucks it into her nice and slow, kissing her gently. Once it's wet it enough he slowly pulls it out and rubs the wet fabric against her clit again.
She cums and he slips it back inside her, forcing her to ride it out.
Now the toy is filthy and it makes her cry, but it's okay. Big bro knows just how to clean sissy's new friend so it will be good as new.
Then the two of them can play with it again whenever she wants.
And she can hump it whenever she thinks about him.