Kat stripped off her skirt and panties and climbed up onto the desk, lowering her pussy onto Sara's waiting mouth. Holding on to the teacher's breasts for support, Kat ground down hard, trying to coat Sara completely with her juices. Meanwhile Lexi and Ana knelt by the desk. Each of them held one of Sara's legs and they opened her as wide as she would go, then slowly they licked their way up until they met in the middle. After sharing a wet kiss they turned and began to tongue the teacher's slippery cunt.
Sara started to moan loudly, and might well have attracted unwanted attention if the sound hadn't been smothered by Kat's crotch. The treatment she was receiving from Lexi and Ana distracted Sara from what she had been doing, making Kat momentarily annoyed; but then again, Kat reflected, it was hard to blame her. So finally Kat took matters into her own hands, fingering herself while rubbing her clit on the teacher's nose and chin until she was finally able to get herself off. When Kat raised herself up to savor the orgasm pulsing through her, Sara's head lolled to one side, her tongue hanging out and a thin stream of drool running down one side of her chin.
Up to this point Kelly Ann had been watching contentedly, leaning with her weight back against the door, skirt lifted and one hand down her panties. But now she was dying to get involved; she motioned to Kat and they switched places.
Ana was now finger-fucking Sara as Lexi licked her clit. Kelly watched a climax ripple visibly through Sara as she lifted herself onto the desk and took up the position Kat had vacated. When Sara failed to respond in the way that Kelly wanted, Kelly slapped her face, hard. That got the teacher's attention -- she stuck her tongue out obediently and Kelly rode her face as Ana and Lexi made her come again, then a third time.
Sara was no longer putting forth much effort, so Kelly scooted forward and sank down onto one of her breasts. Kelly quite enjoyed the feeling of the warm flesh pressing into her as she rubbed herself to orgasm. Afterward Kelly jumped off and for a minute they all stood looking down at the slumped form of Sara Valentine, skirt bunched up around her waist, juice-smeared mouth frozen in a lewd grin.