On her back

You didn't want to risk angering your newest lover by cumming where you weren't supposed to. You decided that it was best to pull out. You thrust yourself toward the edge before finally reaching the point of no return. You fought every one of your instincts as you suddenly felt the cold open air. You didn't even need to stroke yourself to the finish. You fired a rope of cum across her back with alarming ****. She just froze and gasped. Needing some form of contact you grabbed her waist and pressed yourself between the welcoming valley of her ass. You ground against her as you continued to empty yourself. She began to move her hips in response to your grinding. This only heightened your experience. You began to let out a small groan with every shot and this caused her to chuckle once more. "Just keep cumming..." she quietly encouraged. This caused you to launch even more silver ribbons across her skin. You never ceased grinding against her but you began to release with less **** now. Eventually your deposits were landing on fabric and not flesh.

You finally stopped moving and just remained where you were. You looked down to admire your work. You left a smattering of pale white ropes from her neck to her lower back. It began to pool in some of the more muscled areas. For her part she just looked forward and let out a contented sigh. It was almost as if she wanted you to see what you had done to her as she did not move until you did. You broke contact and stepped back, putting what remained of your erection back into your boxers. She looked back at you and chuckled once more before rising off the desk. You could already see gravity taking its effect as more of your seed raced towards the fabric of her skirt. She spun the skirt around and looked down past her stomach at the result of your mating.

She shook her head and clicked her tongue in a 'tsk'. "You're lucky I bring extra clothes," she revealed as she slid the skirt to her feet. She stepped out of it and made her way to the filing cabinet where there was a spare skirt in the bottom drawer. You watched her form as she dressed herself. She was lithe and sleek in a very erotic way. She made no effort to clean herself and acted as if you there wasn't actually two balls worth of semen on her back. When she was finally presentable again she grabbed her skirt off the floor and held out her hand as if expecting something. "Backpack," she sternly commanded. You quickly grabbed it and presented it to her. She opened it and placed the soiled skirt inside before handing the bag back. "Just a reminder of what's in store if you keep your grades up," she said matter-of-factly. "Now behave in the rest of your classes today," she said as she motioned to the door.

You made your way home determined to do well in German.