Head to Katherine's office.

Katherine's office was messy; several documents were scattered on her desk, open filing cabinets with pages spilling out lined the room. An electric water heater was placed on top of a small table in the corner, surrounded by various instant coffees and tea bags. Annabelle was sat on a simple leather couch off to one side as Katherine was busy organizing documents.

"What was that about?" asked Annabelle, who had a dumbfounded look.

"Don't mind him, he's just jealous of my work," said Katherine as she organized a mess of papers like a deck of cards. "These senior researchers always think they're better than the rest of us, bossing us around, telling us what we can and can't do. I think he's just worried that I might take his position someday as head researcher."

"Thanks for being here by the way, and please, make yourself at home," said Katherine as she stuffed the stack of papers into a nearby filing cabinet. "Decaf?"

"Sure," answered Annabelle, as she finally started to relax. "Any time, Kat. Wow, so you're, like, a full-on researcher now? Weren't you just an intern just last year?"

"Yup!" exclaimed Katherine as she switched on a water boiler. "The board loved my work on hormone therapy so much that they offered me a job full-time and asked me to continue my work, my own office and all."

Katherine handed Annabelle a cup of hot tea, before taking a seat on the couch. "So, what's this dangerous experimental trial about?" Annabelle asked as she took a sip before handing the cup to Katherine.

"Oh, you'll see, you might even enjoy it," said Katherine as she smiled and took a sip of her own, before placing the cup off to the side. "But before I tell you anything, we have to go through several formalities. You'll need to be examined to make sure you're fit for the task, just a routine checkup. Nurse should be here in maybe half an hour."

Annabelle sat quietly for a moment, listening for any signs of movement on the other side of the door. As if telepathically linked, Katherine knew what she was thinking and listened in as well. They heard nothing. "Any time for some destress, then?" Annabelle offered, smiling.

Kat blushed and considered Annabelle's offer for a moment. "You haven't changed a bit," she giggled. Annabelle leaned in and gave her a quick peck before going in for a deeper kiss. Her experienced tongue danced around Kat's mouth, making sloppy, soft noises.

'Destress' was their codeword for passionate sex, or just simply needing to cum, originating from their time in college. Usually, they would do it from the sanctity of their dorms, but sometimes, especially during exam season when the schedules were tightest and they needed particularly to quell their nerves, they would find an empty classroom, clean bathroom stall or even an empty corner of the library. She recalled a time where before a difficult exam, Kat was spread eagle on the professor's desk, fully nude atop their notes and textbooks, covering her mouth to avoid making any noise, and Annabelle was sucking on her clitoris, fingering her vagina. They then spent the next half hour trying to dry up Kat's term paper before turning it in and hoping the professor didn't notice the pussy juice.

"You feel tense, Kat," Annabelle whispered as she moved her hands to Katherine's shoulders and started massaging. Katherine breathed a sigh and leaned back on the sofa arm, relaxing from the comfort of her ex-roommate. Annabelle leaned over her as they resumed their tongue dance with added intensity, Annabelle's arms now draped around Katherine's hips. Katherine herself placed a hand on Annabelle's chest and began massaging.

Suddenly, they heard quick footsteps approach as the door swung open. They quickly sat up and pulled away from each other.

"Hey, Katherine, I finished up some work early so we can get started with your patient assessment," in briskly walked a fit Brunette woman in her 30s. Her hair was in a low bun, and she was wearing scrubs. She stared at the two girls on the couch, both seated in awkward positions, both red in the face. "Oh, was I interrupting something?"

"N-not at all!" Katherine said, as she jumped to her feet. "Annabelle, this is nurse Kelly, she'll be your assessor."

"Follow me, sweetheart," she said before swiftly exiting the room. Annabelle, still flushed, awkwardly waved goodbye before following the nurse out the door.