Simple Agreement

Chapter Two: Agreement

Casey's POV

Casey took another step towards Derek, and smiled as she saw him shift his position to hide his hardening erection. She saw him steal glances at her breasts and her hardened nipples through her bath robe. She resisted the urge to slip a hand down to her pussy and start rubbing it again.

She supposed it all started about two weeks ago when she started taking her showers late at night. She liked the peace the night time brought. With everyone asleep the house was so quiet. Well everyone except Derek, but surprisingly even he had been pretty quiet at night lately.

So she greatly enjoyed her nightly showers. It was as if the hot water seeped into all of her most intimate places and relaxed her. She had never been one for masturbating but lately in her showers she would let her hand slip down to her moist opening and rub it a little, but it never stayed down there very long as when she did this she felt a little jolt run throughout her whole body. It wasn't unpleasant by any means, just different. Of course she knew all the mechanics of sex and masturbating, but she always thought she was above masturbating, and she wanted to wait until she was married to have sex.

But a little more than a week ago, she had just finished up her shower, got dressed, and headed back to her room. But then she saw that Derek's room door was open. She thought this was really strange as she remembered him fighting his dad tooth and nail about keeping it closed all the time. So she quietly tip toed across the hall and peered into his room. He wasn't in there. Odd.... she thought. So she went back into her room and left the door open about an inch and peeked into the empty hallway. A minute later she saw the closet door open and Derek walk out of it and into his room and close his door.

She felt her face get red as she realized what was going on. But she wanted to be sure. So she grabbed a flashlight and walked to the closet, and clicked on her light. There were some coats in front of the wall, and when she moved them aside her light fell on his hole. 'Son of a bitch!' She thought. She was about to charge into his room and start yelling at him, when she noticed an unexpected reaction from her body. That familiar urge that she had been feeling for the past week came back, as she realized that she was getting slightly aroused at the thought of him watching her shower. She had never really thought about him that way, but even she couldn't miss how hot her step brother was. So she decided that for a while she would let this continue and see how it played out.

But she still wanted to check one more thing. After her shower the next night she texted him from the bathroom. It was hard to make out over her music, but she did hear the unmistakable sound of his phone going off behind that wall. She smiled a little but pretended like she hadn't heard it.

So tonight when she took her nightly shower, she decided to give him a little show. She had noticed that ever since she found out Derek was watching her, that she was getting a little more brave with rubbing her pussy. Her hand would stay down there just a little bit longer than usual. But it wasn't enough. So she exited the shower, got a towel, wrapped it around her hair, and started to dance a little to her music. She felt herself getting aroused again. She felt the cool air on her nipples, causing them to harden. Then she couldn't take it anymore as she slipped her right hand down to her moist slit, and began rubbing it, and knowing that he was watching her made her all the more horny. Her hand started going faster, as the beat of the music picked up. She loved the feeling of her tits bouncing up and down, and then she thought of what Derek might be doing behind that wall too, and that was enough to send her over the edge in an earthshatering orgasm. She removed her hand as she felt a wave of pleasure wash over her, and felt her juices dripping down her thighs. That was way more intense than she ever thought it would be. And it was then when a plan started to form in her head. She wanted to experience that feeling again, and she had a feeling Derek would too.

So she slipped on her bath robe, and tightened it so that her still wet tits were pressed against it. She looked into the mirror and smiled seductively, her nipples were still hard, and could clearly be seen poking against the thin fabric of her robe.

And now she was in Derek's room, smiling at his beat red face. "Um, What do you mean Case?" he replied innocently with a bit of a lump in his throat. She smiled even wider at this, as she moved to sit in the chair in his room, and leaned forward giving him a clear view at her ample cleavage. "You heard me. I want to talk about what you've been doing while I take my showers. I know you've been watching me Derek. I want to propose an agreement with you." She said calmly. His eye's were constantly darting between her eye's and her tits. She knew at this point he wouldn't be able to deny it any more.

"What do you mean? What kind of agreement?" He said, while still choking on his words a bit, but this time with a tinge of curiosity. "Well, I'm assuming you like what you've been seeing and you don't want it to stop right?" She asked. He nodded his head slowly. "Good, then here is the arrangement. I will continue to allow you to watch me take my showers, but there are a few conditions. One, you will come into the bathroom with me to watch. Two, you will not move or say a word unless I speak to you or I give you an order, and you must follow my orders whatever they are. Three, you will not masturbate or please yourself in any way unless I tell you you can. Four, when we are both not in the bathroom, you will not masturbate at all. And in return..." She paused a moment allowing everything to sink in as she looked at his face. It was covered in sweat. "In return," she continued, "the same conditions will apply to me when you take your showers. I will be forced to sit and do nothing but obey you when you are the one taking the shower. So, how bout it? It's certainly better than the alternative of me telling your dad what you've been doing."

At this point Derek looked like he might faint, then his expression cleared, probably finally realizing that no, he was not dreaming, and yes she really did just say all of that. Then he uttered one word, "Deal." Casey smiled wide, got up from her chair, walked over to his bed, and gave him a quick kiss on the lips, and said, "good, then tomorrow night before I take my shower I'll come get you, and you'll join me in the bathroom." Then she turned around and walked out the door, leaving a stunned and horny Derek lying on his bed.

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