Rectal Thermometer

Kayla grinned as she pulled out a thermometer she was saving just for this occasion along with a tub of vaseline. She gazed toward the door and noticed some students spying inside. She smirked as she opened the vaseline and stirred her finger inside. “Now raise that bottom of yours high in the air.”

Alexa slowly raised her hips allowing her butt to lift up, unaware of the growing audience. Kayla rubbed the vaseline circling her butthole as it puckered in response. “W-wait, what are you…” Alexa said her eyes widening as she saw the thermometer in hand. “No!”

The thermometer slipped into her anus protruding out from her cheeks leaving Alexa feeling utterly humiliated at the childish instrument. She squirmed and squirmed unable to hold still anymore.

“Hold still!” Kayla yelled. “It won’t work if you keep squirming!”