You start to jack off as you fantasise about Michelle's awesome rack. She's quite up front and proud about her cup size so you know pretty much as soon as her measurements change. The last time she came bounding into your room she gleefully told you that her boobs were now a hefty 32F cup, and squeezed them together in her bra as if to show them off. Her big tits look especially huge on her small frame, and she hardly ever wears tops that are not super tight and that do not push her chestmeat up and out with as much plunging cleavage as she can manage. Just thinking about how she looks in the outfits she wears on nights out makes your cock throb even harder.
But how she looks isn't the only reason you've got the lust for your sister... |