Chris gets his period and goes for an exam. He loses his virginity - both as a male and as a female.
She took his penis on her gloved hands and leaned it, minutely examining the shaft, the head. She pulled back the skin on the head and peered into the hole. His cock grew rock hard in her hand. She smiled and ran her hand up and down the shaft. “Do you want this, Chris?”
He swallowed hard and nodded his head again, incapable of speech. Immediately her head hovered over him as she took him deep into her mouth.
“Wait, I have an idea,” her head bobbed up and she turned towards the cabinet behind her. “I want to get blood and urine,” she said. She held up a sterile specimen cup and a long, hose-like tube.
“It's a catheter, and hollow. If you don't mind, I'd like to see if I can hit your bladder. You'll pee through this and I can get a very clean catch.”