Megan shifted in her seat, pulling the waistband of her pants down a bit and suppressing a moan as a tail wriggled forth, small at first but rapidly lengthening to a ropy furry foot-long appendage that dangled down behind her. It flicked unconsciously, its tufted tip brushing against Jen’s knee.
Jen pretended to take the test as she slipped one hand down below the desk and silently unbuttoned her pants. Her hand slipped down her panties as she watched grayish brown fur spread up and over Megan's shoulders and down her arms. She couldn't see her friend's face, but she knew it had to be sprouting fur and shifting and stretching into…
“Hawww…” Megan brayed softly. Her tail flicked against Jen’s knee again. Jen bit back a whimper as she nearly came on the spot to the sound her friend had just made. And that donkey tail flicking her knee, almost like Megan was teasing her...
“Quiet please, miss Greene” Mr. Parker didn't even look up from his desk as he admonished Megan.
“Sorry,” Megan mumbled as she turned to give Jen a look. Jen couldn't help but plunge her fingers into her dripping pussy as she saw her friend's donkey-like face. She wanted to feel those lips pressed against hers, feel her animal tongue dart into her mouth, feel her trail down her chest and belly, stopping along the way to suck at her nipple before…
Thwip! Megan’s tail flicked against her knee again. She locked eyes with Jen and smirked before kicking her shoes off and returning to the test.
Jen couldn't help herself. That look, the tail flicks...she noticed Megan's ears were swiveled back, listening to her. She knew she was getting off in class and she was teasing her! She watched as Megan shifted in her chair, curling her feet under and into her view. She went from fingering to frantically rubbing her clit as she watched Megan’s socks stretch, then bulge. God, she was close! Megan's socks stretched tighter and tighter, then finally ripped as her new hooves burst free. Jen clutched the side of her desk and bit her lip. It was everything she could do to not scream out as the orgasm rocked her body.
Jen looked around after the last wave of pleasure passed, trying to settle down inconspicuously in the afterglow. One or two of the other students had noticed what she was doing. They stared at her in shock and averted their eyes when hers met them. None of them seemed to notice Megan's transformation though. How could that be? She blushed and tried to return her attention to her test. She found herself distracted and guessing at answers. She looked at the clock and groaned. Only fifteen more minutes to finish the test! She began eliminating clearly wrong answers and guessing from the remaining choices, filling in the bubbles frantically. Just as she filled in the last answer the bell rang.
“All right everybody, pencils down,” the teacher called. “Bring your tests to my desk, please.”
Jen watched Megan get up and head to the front with the rest of the class to turn her test in. The way the donkey girl's tail swayed with the motion of her hips, she felt herself melt a little bit just wishing she could get five or ten minutes alone with her right then and there.
Megan passed her desk on the way out to the hall. She leaned down and whispered in her ear, “I dont know how you did this, but I know it was you. We'll talk about it today after cheer practice.” She walked off, but not before making sure Jen got a good look at the bulge that ran down her pants leg almost down to her knee.
Jen quivered in her seat, fighting off the urge to grab Megan by the ass and pull her close and jack her off through her pants right there in front of everyone. She steeled herself and turned in her test before heading to her second period.