Set in the episode 'The Caretaker'. When Danny uses the invisibility watch to see how Clara acts around the Doctor. The Doctor knows that Danny is there so he does something which he knows will make Danny flip. He kisses Clara.

Clara and Danny stood outside the Caretaker's storeroom, Clara handed him the invisibility watch.

"An invisibility watch?" Danny asked as he put the watch around his wrist.

"Press the button on the side, you're invisible. You'll see me with the Doctor, the other me. The exactly the same other me. Okay?" Clara assured. Danny nodded as they headed into the building and towards the TARDIS.

Danny pressed the button on the side of the watch before they entered the TARDIS. Clara looked at the Doctor who was working on some sort of contraption, "Afternoon." he began, "Thanks for keeping out of my way. You haven't bought Dave with you, I hope." the Doctor's eyes widened slightly when he felt a light shield aura next to him... So PE was here...

"His name's Danny. And no, I haven't." the Doctor could see right through her lies as his gaze remained on the contraption in his hands, "I've er, I explained it all to him. He gets it. He took it really well."

"Pass me that synestic." the Doctor said to her. Clara did just that.

"So, when the Blitzer comes back, are you going to catch him with that?" she asked.

The Doctor tried to think about what he could possibly do to tip PE over the edge, "It'll be a long, fiddly job." he sighed, "It's going to take me at least twenty four hours. Even longer if people keep talking to me, so do keep going."

"If it comes back Thursday night, are you sure about that? Cos you said the chronodyne is unstable."

"If you want to bother someone, go and bother PE." he said, convincing Clara that he didn't know about Danny's presence.

"He's a maths teacher." Clara tried to correct.

"That's a shame, I like maths."

"Not a soldier." Clara stated. Then there was a few seconds of silence.

"I'm bored." I quickly stood up, "Let's go somewhere fun. What do you say? Do you want to see the Thames frozen over? Oh, those frost fairs!" the Doctor exclaimed as he went around the console pulling various levers. Clara followed, returning all of them back to neutral. This confirmed his suspicions that PE WAS truly here.

Clara's voice filled with worry, "But you can't! The Skovox thing."

"It's a time machine. We can get back straight away, like we always do on your dates. Just make sure you don't get yourself a tan or anything, or lose a limb."

"I don't think we should, not this time." Clara replied. The Doctor continued to think about something that he could to make PE flip.

"You've never said no before. No even in the middle of dinner. Remember when you had to eat two meals in a row?" an idea then popped into his head.

"I just think, with the school in danger..." Clara trailed off.

The Doctor nodded, "Okay." he paused, "Can you help me with something that I've been needing to do for a while then?"

"What could you possibly need help with?" she wondered.

"Just help me with this very specific task, then I can let you go."

She looked at him in confusion, "Can you explain what this 'task' is actually about?" The Doctor paced around the console, thinking whether or not if this was actually the right thing to do. He stopped in front of Clara, it's now or never.

"Right..." he started, "This is the task... it's quite an important task actually."

"Can you just tell me what it is plea-" Clara forgot all about Danny's presence as the Doctor's lips collided with hers. Clara felt like her heart had stopped and on instinct she started to kiss back. She then realised that Danny was in the room, she quickly pulled back as Danny became visible.

"Ah, PE. I didn't know you were here!" the Doctor exclaimed, sarcasm clearly in his voice. The Doctor headed to the other side of the console and started to mess with some levers.

"Clara? I thought you said that you didn't love him!" Danny exclaimed.

"I d-don't!" she said with a shaky voice.

The Doctor looked over at them with no emotion on his face, "Being a Time Lord, I can feel a light shield aura when it's right next to me."

"Time Lord?! I should have known!" Danny said with his own sarcasm. He then looked at Clara, "Are you serious Clara?! You tell me that you don't have feelings for him but then you go ahead and kiss him!?"

"I'm not the one who initiated it!" she replied. The Doctor watched this scene play out. He rolled his eyes as a small smirk started to make its way onto his face.

"Ah but you enjoyed it, Clara..." the Doctor teased.

"Doctor. Shut up." she warned.

"But you did, Clara!" Danny added.

"Are you taking his side in this Danny?" Clara questioned.

"Of course I'm not! I hate him even more than I previously did!" Danny assured. The TARDIS made a sound as if she was enjoying what was happening.

"Right, get out of my Tardis if you're just going to argue all day!" the Doctor sighed.

"No." Danny started as he looked at the Doctor, "You knew that I was her boyfriend and yet you go ahead and do something like that!"

He shrugged, "I was hoping that she would choose someone else other than a solider. Now... can you get out of my Tardis. I have some work to do if you still want me to save this school!"

Danny instantly stormed off out of the TARDIS, Clara called, "Danny, wait!" Danny had already left the Caretaker's storeroom. Clara then turned to glare at the Doctor. He raised an eyebrow at her in response.

"What seems to be the problem?" he asked.

"Are you being serious?!" she questioned.

"I'm not a mind reader, Clara!"

"Actually, yes you are!" she corrected.

"Fair point." the Doctor replied as he headed back over to the contraption he was working on previously.

"You can't just brush this off, Doctor!" Clara said with a hint of annoyance and anger.

"Brush what off?"

"You kissed me!" she exclaimed.

"Good observation." he muttered in response as he used some tools on the contraption within his hands.

"Are you trying to make my life a living hell!?"

"Not intentionally, no." he replied, considering whether it was a mistake kissing Clara. The Doctor then turned and said without thinking, "Me or him, Clara."

"Wh-What?" she asked in confusion.

"I don't want to get in the way of your relationship with him. If you choose Danny we can have one more trip together and then we can go our separate ways."

Clara looked at him in shock, "Why? Why would you make me choose something like that!?"

"Because I don't want Danny getting in the way of things!" he replied, "Once I have dealt with the Skovox Blitzer, I'm leaving. With or without you." he started, "It's your choice, Clara!"

"Why are you so jealous?!" Clara asked.

"Jealous? Of what exactly?"

"Danny." she simply said.

The Doctor groaned as he turned back around to look at his almost complete contraption, "I'm not jealous, Clara."

"You're clearly lying." she saw right through him, "Why don't you just admit that you're jealous? I would consider staying with you if you would just tell me how you bloody feel, Doctor!"

"I'm not jealous." he would never admit it, "Now go. I'm on a tight schedule."

"But you don't want me to go, Doctor. Tell me I'm wrong and I will leave."

Silence. The Doctor said but soon regretted it, "I have work to do, Clara. Now leave before I let you deal with this Skovox Blitzer alone."

Clara turned and left the TARDIS. Slamming the door behind her.

I'M NOT SURE IF I SHOULD ADD ANOTHER PART TO THIS STORY!