Why settle for one when you can have two?

You ponder for a moment and then announce that you'd like a simultaneous rim job and arse fuck. Since Minseo is the boss, you entrust her with the responsibility of organizing your perverted sex session, curious to see how she will arrange matters to ensure your satisfaction.

She begins by helping Natalie back round the table and having her kneel on the floor in front of you.

"Camel pose, please," she says and Natalie immediately bends over backwards to put her hands on her ankles, gasping with the discomfort caused by her recent flogging. She's now in the perfect position to toss your salad, but you're doubtful whether her slender neck will be able to support your weight if you sit on her face. Nonetheless, this is what Minseo intends, as she invites you to sit while she peels off her bustier to give you some additional visual stimulation in the form of her modest but pleasingly round boobies.

You drop your trousers and pants, then lower yourself tentatively, but it turns out you have nothing to fear. Natalie burrows her face between your cheeks, her tongue thrusting eagerly into your disgusting brown crevice and Minseo turns around to present her own rather more enticing bum hole to your lascivious gaze. Pulling her glossy dark hair in front of her body, she mounts your already-stiff prick with the agility of a gymnast and sinks onto your shaft, giving a slight moan when her thrashed buttocks touch your hips.

She starts to bounce up and down on your cock, virtually jumping in the air as her rectum massages your manhood. You grab her tits in both hands, digging in your fingers and giving her movements greater impetus. Her tight arse has clearly been lubricated in preparation for the possibility of needing to tip with bum sex, but it by no means makes the act painless for her. Despite the added weight of a nineteen year old girl thrusting energetically on top of you, Natalie doesn't seem to have any difficulty supporting you both.

Soon, your moans of lust drown out Minseo's grunts of pain and exertion, your fingers finding her stiff nipples, squeezing and twisting them viciously. You can feel your climax approaching and the two girls pleasuring you must sense this, because they redouble their efforts, grinding and tonguing with abandon. When your orgasm erupts into Minseo's bowels, all your admonitions about not disturbing your neighbours are forgotten and you cry out in passion.

Your students' movements slow, but they continue to gently stimulate you with tongue and arse until you push Minseo off you and struggle to your feet. The girls thank you for allowing them to service you and you quickly clean the traces of cum off your dick in Natalie's mouth, before dismissing them both.

By the time you've put your clothes in order, they've both dressed and packed their things away. Checking your watch, you're pleased to discover that you've managed to finish in plenty of time for the next tutorial. Cheerfully, you say goodbye to your current students and although they both still have tears on their faces, they manage to bravely tell you how much they appreciate your dedication to their education and look forward to next week. It might be your imagination, but perhaps their body language as they leave is slightly less hostile to one another than when they arrived. You close the door with a sigh of contentment and get ready for the next pair to arrive.