As his freshman year in college was coming to a close, Sebastian couldn't be happier with his life. He landed several more roles in commercials and also a swimsuit campaign. All that, plus dating a hot bikini model made him more and more popular. In about a week, Cheryl was to be a part of a huge fashion show, which of course he would attend along with Kathryn. Kathryn, as expected, exploited his success to advance herself in social circles which made her more generous towards him than ever. They weren't able to get together as often as he wanted, but every time they got together it was very special. There was always something new and exciting to experience in Kathryn's bed.
When Sebastian attended a small Friday night party with some friends he was the focus of attention. His girlfriend, Cheryl couldn't join him. They were supposed to get together the next day and spend the weekend together in a hotel suite. He was surprised to see Cecile there. He hasn't seen her in a while. It turned out she knew someone at the party and showed up. He was also surprised by how hot she looked. She wore a black miniskirt and a tight t-shirt which revealed an attractive body. He had sex with her on numerous occasions but he also has sex with dozens of much hotter girls. Other boys at the party were flirting with her and he overheard her talking about her fantastic personal trainer. When she asked him to share a cab with her as they were leaving he couldn't refuse. When she placed her hand on his thigh while they were in the cab he became very hard. That night was different that the other times he was with Cecile. She wasn't simple lying there. She was intense and aggressive and knew exactly what she wanted. His hands were running all over her body. When he looked at himself in the mirror as he was fucking her in doggie style position he thought to himself that she was probably among the best ten all time. He had to update his little notebook. After cumming for the fourth time that night, just before falling asleep, he thought to himself that maybe she was among the top five all time and he should probably update his notebook.
When Kathryn got up the nest morning and walked into the kitchen she was shocked to see Cecile there. However after a second she realized why she was there.
"Hey Cecile, did you, hmm, spend the night with Sebastian?"
"I sure did."
Kathryn was furious. How could Sebastian just throw away what they have worked so hard to achieve? If Cheryl would find out it would ruin all her plans.
"You do know that Sebastian has a girlfriend, don't you?"
"So what? I have a boyfriend."
"Fine, I won't tell anyone."
"By all means Kathryn, tell anyone you want. So people will know I slept with the boyfriend of a famous model, that will sure get my name in the paper."
Again, Kathryn was shocked. Cecile has really changed.
"What about your boyfriend, Cecile?"
"Who cares? I get many offers, Kathryn. I won't be alone for a moment, especially after I give everyone details about last night. Besides, my boyfriend is wrapped around my finger, he'll never dump me."
Kathryn was even more amazed. Cecile was like a completely new person.
"Look, Cecile it would really help Sebastian if you didn't tell anyone. He loves Cheryl and, you know…"
"What's it to you, Kathryn? You're afraid what it will do to your reputation? Please, I'm tired of being manipulated. I'm outta here, Kathryn, bye."
"Hey Cecile, will you at least promise me not to tell anyone until we talk about it some more?"
Cecile hesitated for a moment and said: "Fine, whatever, let's get together this afternoon."
After she left Kathryn walked up to Sebastian's room and woke him up with her screams and punched.
"Sebastian Valmont, what the hell were you thinking?"
Sebastian woke up but couldn't grasp what was going on. Kathryn just kept screaming at him. After a couple of minutes he realized she was upset about Cecile and said: "What the hell do you care?"
"She said she would tell and everybody knows you dating Cheryl, our reputation, that will destroy us! We're supposed to attend the fashion show in a week remember? We won't be able to if Cheryl dumps you!"
"No one will believe her, sis."
"Really? Nobody saw you two leave together? God you're an idiot! Cheating like this on your bikini model girlfriend and with Cecile, God damn it Sebastian. What the hell were you thinking?"
Sebastian tried to argue with her but realized she was right.
"Look", she said, "I'm getting together with her this afternoon, I want you as far away from here as humanely possible, can you do that?" Sebastian just stared at her. "Can you do that?" She asked again.
"Yes." He finally said.
"Good."
When Cecile showed up later Kathryn tried to be as nice as possible to her, but she was very stubborn. The argument became more intense and voices were raised. Eventually Cecile said: "What does this have to do with you anyway, Kathryn? This is going to be Sebastian's problem, not yours!"
Kathryn just stared at her. "You're right, Cecile, this has nothing to do with me. I guess I'm just jealous."
"Jealous?" Cecile asked.
"Yes, jealous." Kathryn replied as she slowly approached Cecile.
"What are you talking about Kathryn?"
"I'm talking about Sebastian who can do whatever he wants and get away with it every time. If he wants you he can just have you, God what an awesome body you have Cecile!" Kathryn placed her hand on Cecile's waist. Cecile was confused. "I…don't get it Kathryn, are you mad at me or mad at Sebastian?"
Kathryn smiled at her. "I can never be mad at you Cecile." She said and kissed Cecile's lips. She felt Cecile was nervous and confused, but she remembered how Cecile was like a couple of years before, when she taught her how to kiss. She knew Cecile was attracted to her. When she kissed her the second time Cecile responded. After a couple of seconds Cecile's tongue was swerving around in her mouth. After several more seconds of kissing Cecile's hand were on her ass. When she reached under Cecile's skirt, she wrapped her leg around her, allowing her to reach to her firm thigh. She then started to kiss her neck. "Oh God, Cecile", Kathryn moaned. Cecile then took a step back. For the first time since they started kissing they looked into each other's eyes. Then, Cecile took off her shirt. Kathryn looked at her amazed. "Fuck Cecile, is this really happening?"
"You better believe it." She replied and took off her bra. Soon Kathryn was licking Cecile's nipples and stomach. As she was doing that she gently pushed towards the bed. When Cecile was on her back Kathryn quickly removed her shoes, skirt and underwear. Cecile's beautiful body was revealed to her. She realized how helpless Sebastian must have been. She then reached into Cecile's body and began pleasuring her. She couldn't quite understand why, but hearing Cecile moaning and panting thrilled her. She continued to kiss Cecile's face, neck and chest. Cecile was completely under her control.
"God Cecile this is awesome", she whispered into her ear which caused her to moan louder. "I wanted you so bad for so long, Cecile, Cum for me Cecile, cum for me babe!" Her fingers were moving inside Cecile's body. "Oh Kathryn", Cecile moaned. Kathryn was thrilled to hear Cecile moan her name. After several more minutes Cecile came and she gently kissed her lips and smiled at her. She knew she would easily seduce Cecile but it surprised how thrilling and enjoyable it actually was.
"Your turn." Cecile said.
"Huh?" Kathryn replied. However before she was able to collect her thought Cecile was on top of her undressing her. When Cecile's fingers entered her body it shocked her how awesome it felt. She let out a loud uncontrollable moan. What was going on? Was it possible that Cecile the imbecile was pleasuring her? Was she actually enjoying having sex with Cecile? How weird was that! Cecile has a boyfriend and last night she cheated on him was Sebastian and now she's having sex with Sebastian's sister! Wow Cecile is so depraved! These thoughts just made her hornier. As she was getting closer to cum she shut her eyes and bit her lower lip, trying to control her moans. She realized that sex for her was about controlling people and having power over them. She now would have so much control and power over Cecile and that made the physical pleasure more and intense. "Oh yes!" She moaned as she came. She opened her eyes and saw Cecile smiling at her. She smiled back at her. When they got dressed Kathryn asked Cecile not to tell anyone about Sebastian. Cecile agreed to wait one more day and they decided to get together again.
When they got together again the next day Kathryn asked Cecile if she gave anymore thought about telling everyone about the night she spent with Sebastian. Cecile said: "I have thought about it Kathryn, and…" As she was talking Kathryn approached her from behind and grabbed her breasts. "Forget about Sebastian Cecile, I have only one thing on my mind since yesterday." She said and kissed her neck. "And that thing is your hot naked body in my bed." Soon, they were totally overcome with lust for each other. Their tongues were swerving around each other and their hands were running all over each other's body, wanting to explore every inch. Kathryn hated to admit it, but knowing that Sebastian has fucked Cecile so many times before just made it as awesome as it could get. As Cecile went down on her she couldn't help thinking about Sebastian and Cecile together and how hot they must have been together. She had one of her best orgasms ever.
Later they cuddled and Cecile's head was resting on her breasts. They talked for a while and then Kathryn said: "You shouldn't tell anyone about Sebastian. You should keep seeing your boyfriend. The sex with your boyfriend is going to be so much hotter now that you're cheating on him."
"Really? You think so?"
"Sure. Didn't your night with Sebastian make what we did so much hotter?"
"Yeah. You're right."
"Listen Cecile, about a week from today Sebastian and I will be attending this fashion show with Sebastian's girlfriend, why don't you come along with your boyfriend, it'll be so much fun! Of course you can't tell anyone about Sebastian and you."
"This is going to be so weird Kathryn, going there with you, Sebastian and my boyfriend…wow three people I'm sleeping with together, wow!"
"And wouldn't it be like the hottest thing ever?"
"Hell yeah! Say Kathryn, you think we two could, you know, get together again, you know, from time to time?"
And as Cecile said that Kathryn started to kiss her and soon they were at it again.
Late on Sunday night Sebastian returned home. He was deeply worried about his night with Cecile being revealed. He did his best to pretend not to worry but he could sense Cheryl suspected something. When he entered his bedroom he found a note on the bed. It read: "Turn on your VCR." He recognized Kathryn's handwriting. What he saw blew him away. On the screen were Kathryn and Cecile making out and having sex! He was deeply aroused. Once again, his step sister was able to surprise him.
Kathryn was lying in bed reading a magazine wearing nothing but her bra and underwear as she heard a knock on her door.
"Come in." She said. Sebastian came in wearing nothing but his boxer shorts.
"Hi there." He said.
"Well, well, well. It it isn't my idiot brother who screws everything up and needs me to clean after him."
"Well, it is your idiot brother." He replied smiling at her.
Kathryn hesitated for a moment. Her plan was to hit him and scream at him for being such an idiot. She thought it would teach him a lesson. She thought it would be fun to turn him away like that when he wanted her so bad. But she wasn't going to do that. Instead, she got up and approached him.
"So Cecile won't be a problem?" He asked.
"Hmmm...let's just say a different problem that we anticipated." She turned her back to him, allowing him to massage her neck.
"Yes that feels so good. All those hours with Cecile in bed sure make me need this."
Sebastian was more aroused that he ever was before.
"So how was your time with Cheryl?"
"It was fine, sis."
"D'you…you know….get it on?"
"A couple of times."
"So a night with Cecile, a couple of times with your bikini model girlfriend, you sure was busy this weekend." She said and grabbed his waist.
"God sis, I want you now more than I ever before."
"Shhh…not so fast Valmont. You do realize you owe me big, right?"
"Absolutely sis. Anything you want."
"Really, anything?"
"Yes, after tonight, anything you want." As he said that he ripped off her bra. He couldn't take anymore teasing. He ripped off her underwear and started to fuck her right there, standing up. They were both so aroused they came very quickly. Afterwards they just got down to the floor and lay there, naked and cuddled. It took Sebastian a while to catch his breath. He said: "So what was it like, sex with Cecile?"
"You know Sebastian", she replied, "I Just missed you so much and wanted to fuck you so bad, but you were gone, so fucking someone whom you just had sex with was the best I could do."
As he heard that he became hard again. Kathryn soon took advantage of that a climbed on top of him. As she started to fuck him she caught a glimpse of herself in the mirror. Sebastian didn't notice that. His eyes were tightly closed and he was facing the ceiling anyway. She smirked at herself. She looked at her perfect breasts bouncing each time she thrust her body against Sebastian's pelvis. He was totally under her control, just like Cecile was. And that thought felt awesome.