Thirteen's POV

The Doctor was at loss, aroused, terrified and so many other emotions that she could not even begin to quantify. She had to tell Rose. Rose was the only one that could communicate with Verity in her stead.

The Doctor didn't know how much time she had, so she was afraid to leave Yaz alone, but she had a brief spark of an idea to put Osgood in the room with her and see what happened.

"Yaz, Adam planned for us to get delayed by your first heat. There is a lot that I have to do to get ready for your heat, much less take you through it and run a rescue effort."

"Then I can wait. I will be ok."

"No. Yaz you can't. Even if you could suffer through a heat as a Gallifreyan, your temperature would still have to be watched. As a human you have a much higher chance of succumbing to the fever."

"Then what do we do?" She asked with fear in her eyes.

"I have an idea, but it involves us getting intimate with another person."

"We've never even been intimate!" She yelled.

"Yes, but you need relief and these are a lot of things I have to do for you, and for this rescue effort. I can only do both if I have someone to help you, and someone to run the rescue effort while I work. This is the only way that Adam won't grind us to a complete halt."

"Alright Doc, I trust you. Is Rose Tyler coming to our bed?" She asked cheekily. "Do I get to do the Avatar of Bad Wolf" Yaz asked as she got frisky again.

"No." I said. I put my hand into my forehead. I need Rose and Martha to co-pilot the TARDIS as well as the recovery missions. I'm sending a fangirl scientist to occupy you, until I get back."

"Oh boy." Yaz replied. I could smell the panic entering her scent.

"Yaz it will be ok. Just please trust me, my love." I begged. She looks me in my eyes for several long seconds and then nods. I take Yaz to a door that just suddenly appeared, knowing that it was the TARDIS' heat room.

When I opened the door, I realized that the TARDIS had already organized everything that I needed into a small, apartment-like ensuite. Preparation for the heat, check. Now to get Yaz comfortable… I took Yaz to the bed and sat her down. I went into the closet and grabbed an assortment of lubes and toys for her and laid them out.

"I will be back with Petronella soon." I told her. She looked at me sadly and nodded. The sadness soon left her face as she took in the collection of toys in front of her.

I slipped out while she was occupied and headed back to the console room. I pulled up the TARDIS' internal systems to try and find Rose and Martha. It turned out that the TARDIS installed intercoms. That was extremely helpful.

According to the TARDIS, Petronella was in the TARDIS closet going through all of my old clothes. The door materialized directly in front of me and I went inside.

"Hello Doctor." She said as she froze, embarrassed because she was caught being a major fangirl.

"Petronella, how much do you know about the Time Lord secondary gender?" I got straight to the point. Yaz probably didn't have long anyway.

"I know that it's almost involuntary, instinctual and likely deadly if unassisted, especially for an Omega's first heat." After she recited the information from her memory she looked up at me. "Why?"

"Yaz was tricked into ingesting Krelsap." I said as if it was that simple.

"Oh boy." Petronella said nervously.

"I need you to do me a massive solid Petty." I said as I turned to her.

"Oh boy." She repeated anxiously. I heard her heartbeat pick up and her breathing accelerate. She took out her inhaler and took a puff.

"I need you to tend to Yaz while I continue to direct the rescue effort."

"Me…" Petronella mouthed silently. I nodded and she disappeared into the TARDIS wardrobe. A few minutes later she came back looking much unlike the Osgood that I know. She was wearing a pastel pink crop top with a cute little teddy bear on it.

Her shorts rode so low that I could see the strings of the thong that she was wearing. She had her hair up in a sporty ponytail and I could tell that her perky C-cups were braless.

After a couple of owlish blinks, I turned on my heels to lead Petty to the correct room. The TARDIS once again, had rearranged the doors, so that we stepped out to the correct one immediately.

I was scared of what I would find behind the door. No… scared was the wrong word. The excitement was too much for me and I could smell the scent of a presenting Omega in heat. Fifteen hundred years of living all lead to this point. Did the Alpha have it in her to hold back until the time was right?

Petronella could sense the unease in me and put a hand on my shoulder. My cock had already begun to perk up and I haven't even opened the door yet. This was going to be the biggest test of the Doctor's life. And so she turned the knob…