It was the end of her senior year of high school, and Lisa was annoyed by the last research paper of the year. Fortunately, she had a deal to have it taken care of by her business partner, Phil. Ever since their deal had started, he had done her history assignments in exchange for a supply of credit that translated into sexual favors. Lisa's roommate Kaori had the same kind of deal with him.
Lately, though, Phil had been getting a surprising amount of action on his own, which was initially not a factor in their deals, so Kaori and Lisa decided to talk to him as soon as they got this assignment. It was possible their business partner wouldn't feel he needed their services anymore, so he wouldn't want to write two extra papers when he could get laid for free.
"Hey Phil," Lisa greeted him casually as they approached him in one of his usual locations. "Got a minute for us?"
Phil took in the sight of his beautiful "clients" when he glanced up from his book. They had similar thin, toned physiques, but there were differences. Kaori was slightly darker, as she was Hawaiian while Lisa was Chinese. Lisa was about two inches taller, and it was all in her great legs. Kaori had a little more substance to her frame, with a noticeably larger rack and rounder ass, which made Phil think she was the prettier one, by a narrow margin. Lisa's eyes were a little deeper-set, and her cheekbones were a little higher, but overall, they were both similar visions proclaiming "sex" to an observer.
"Absolutely. I guess you want to talk about the research paper in history class." The girls acknowledged this. "Don't worry, I'll still do it." Relief washed over the girls' faces. "Actually, we should go to the library now; there won't be many people there at this hour."
"Why would we go to the library for you to do our research?"
"Well, sweetie, one of the easiest ways to catch onto people who aren't actually writing research papers is to check with the librarian to see if they've checked anything out recently. If I check out all the books, and you two check out nothing, our teacher isn't _that_ stupid; he'd catch on. So you two will come with me, even into the stacks." They assented once they understood.
The library wasn't that far away, and within ten minutes they were inside the stacks. Their boarding school shared a library with the surrounding town, so it was far larger than any ordinary high school library, with several floors of books. Phil quickly found what they needed and set it aside on a study table.
"Now, ladies, there is the matter of your accounts with me."
Lisa sidled up to him and put her hands on his chest. "Ooo, Phil, wanna fuck us in the stacks?"
"Yes, but I've got some other special requests. See that good-looking straight-laced girl over there? Kaori, I want you to go seduce her. If you can get your tongue in her box and make her cum, Lisa will ravage you when you come back. If after you get into her, you convince her to go down on you, when you come back Lisa and I will please you together." Lisa and Kaori, Asian and Hawaiian features not usually prone to blushing, were quite red in the face now. They looked at each other, expressions somewhere between giggling and hesitation, then looked back at Phil.
"Later there will be more, but for now, go get her." While Kaori walked over to the girl, Phil took Lisa to an angle where they were concealed behind a shelf, but with a few books pushed to the side, they could see the aisle Kaori would soon be in. Phil then looked at Lisa. "Lean up against this shelf."
Lisa could feel herself getting very wet, and hoped she would soon have some relief. This situation was so improbable that as more and more of what Phil wanted was revealed, she kept getting more aroused. As she leaned against the shelving (fortunately very well-supported shelving), Phil spread her hands a little wider, then her legs. Lisa thought to herself how good her decision to wear a miniskirt had been today.
Phil reached around and started unbuttoning her top, pressing his groin against her ass. Just as he did so, Kaori started talking to the anonymous girl. As Kaori touched her new friend's shoulder, Lisa felt Phil's hands go around her abs, working up her back to her bra clasp. He undid it and worked his hands slowly back around to her front, grabbing hold of her breasts as they watched Kaori lean in to kiss the girl.
Soon Kaori had the girl with her back pushed against the shelving, both of Kaori's hands groping her obscenely as shirt buttons were undone, or in Kaori's case, the shirt went off straight over her head, revealing her braless breasts, which almost magnetically attracted a groping hand of their own.
Lisa, impatient and increasingly turned on, pushed her pelvis back against Phil's groin, and he released her rack for a few moments to pull her panties down and bring his cock into the open. He rubbed his end against Lisa's desperate lips, but denied her penetration even as she moaned with desire. Only when Kaori got on her knees and attacked her partner's lower body garments did Phil thrust forward. Lisa, a loud lover, had to consciously keep her mouth closed as she let out the built up moan, to prevent being overheard. Her drenched cunt enveloped Phil easily, and she quickly tried to accelerate the pace to bring herself off.