Following dinner Lucy tells her brother that he is going to have to have a bath. The stench is so over powering and it is beginning to nauseate her. He asks just who is going to bath him. When she says she is, he just laughs it off. He just can’t picture his baby sister giving him a bath like he was a toddler. He told her it would be too embarrassing for both of them. She dismisses his whining and takes his dirty dinner dishes to the kitchen. Once he sees her gathering everything needed for a sponge bath, he resided himself to the fact it was going to take place. Regardless of how embarrassing it might be, Lucy had no intentions of smelling his dirty, stinky body any longer. Once his little sister says she is going to do something, you can bet it is going to be done.
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Jim does a double-take when Cathy comes downstairs from her bedroom wearing only a long tight white t-shirt that emphasis her hard nipples. But his glance is subtle and he doesn’t say anything. Their favorite TV show is coming on so she hustles to the kitchen to get something to drink. When she returns to the den she intentionally drops something on the floor. When she bends over to retrieve it, her t-shirt rides up revealing she is not wearing panties. She giggles quietly to herself as she sees out of the corner of her eye, her Dad adjusting his giant erection. All that evening she tries to keep a sideways eye on him, hoping to catch him sneaking a peak at her sexy body on display. But she never does catch him.

Was I wrong about his attraction to me, she thinks to herself?
They sit quietly watching television for about two hour. During that two hours Cathy’s nipples jump to attention several times. Each time her Dad’s cock springs alive also. Finally Jim announces he is going to take a shower then go to bed. Cathy begins to picture her Dad naked in the shower. She can’t fight the temptation to sneak into his bedroom and watch him shower.
She decides it might work if she goes to his bathroom door and asks a question, and then pretend she can’t hear his response and open the door. If he doesn’t object to being seen naked, she will strip off her t-shirt and join him in the shower.

As she approaches his bedroom she can hear the shower. She figures she'd just stand outside the bathroom door and ask him a question. But the door is already open halfway and she angles so she can see her Dad in the full-length mirror. The fogged glass of the shower doors affords little privacy, and she clearly sees him jerking off.