The fourth installment of the series is a trap set by her brother-in-law for a diuretic! Without even realizing it, she fidgets as the need to pee gradually builds up... Moreover, she is prevented from going to the toilet, causing a big panic! The brother-in-law, excited by the sight of his sister suffering like that, suddenly changes his attitude! He pushes her down and inserts his big dick! He thrusts his dick into her pussy, causing her to urinate non-stop! She drowns in forbidden incestuous sex that leaves the whole house covered in embarrassing juices!