Thanks for your reviews and corrections, they meant a lot to me!

So, the last chapter was from Penny's point of view, so this chapter will be from Sheldon's. I hope you'll enjoy it! Please review :)

Sheldon just stood on the hall and stared at the girl behind the door. His mind was going quickly on the effect that was on him. He still felt the girl's soft lips on his mouth and the electric ignition that annealed his whole body during the kiss. Due to his eidetic memory he could play over and over the recent event in his mind.

"Interesting" he said finally and went to his apartment to prepare for sleeping.

"It is indeed interesting" he thought. His body had never got that react by any other human touch. He remembered his mother's and his grandmother's hugs when they had wanted to protect him from the mean world with their bodies' heat. He remembered the touches of Missy and George Jr., those were bites, pinches, strikes and scratches. Those had caused only just pain.

Then he recalled the moment when the drunk Beverly Hofstadter kissed him. After he had analysed the situation by the professionals' instructions, he concluded that what he had been feeling was a mix of pity, disgust and amazement. The smell of alcohol and the rough lips caused distaste in him altough he was totally surprised that how a beautiful mind like Leonard's mother could be overcome by the alcohol's temptation and he felt pity for the woman. He tried to look at the memory as a runtime error.

After that he remembered the occasions when he was kissed by Amy Farah Fowler. Those kisses had no effects on him, he only felt emptiness inside him. He thought it was a proof that he was a Homo Novus on whom human contacts had no effects. Because he considered kissing as the non-optional social conventional part of their relationship which was needed to the inferior people like Amy Farah Fowler, he subjected himself to Amy's wish but he never initiated it.

This time was totally different from the others. He felt like he was juiced by an electric power that started at his lips where Penny touched them and which flashed throughout his whole body down to his tiptoes. He felt the buzz in his whole body and he had to admit that it was not bad at all. That was a surprising discovery for him.

Now that he realized what had happened to him, his scientist mind asked himself: why? Why was it a good feeling? He had been kissed by other women before so it wasn't a new thing for him. But the pleasantly exciting feeling in his stomach was totally new for him. It was something he had to study and examine and figure out the reason behind this feeling. Was it something in his drink or his food at the univerity? Was it because of the chilly breeze in the hall? Or was it because Penny was so much experienced in kissing? Or was it because of the soft lips of Penny? He realized there were too many options so he needed more data to find an answer to his question. He had to generate the feeling again with another kiss from Penny.

Yes, he would ask Penny to kiss him again, he thought while he was preparing himself for his night-sleeping. When he closed his eyes he could smell the gentle vanilla scent and see the blonde girl's face when she reached him. He was smiling when he fall asleep.

It was until Tuesday when he had a chance to talk with Penny. On Sunday Penny was sleeping late in the morning and she had to work in the afternoon and the evening. On Monday Sheldon was disturbed by the moving of his new roommate at his workplace. Marc Stapeton brought a new desk, his whiteboards and flowers because they relaxed him at work. Most of the professors and employees of the university came by at their room to greet the famous dr. Stapeton and asked how he felt here and if he needed anything disturbing Sheldon at his calculations. Yet Leonard and Raj came to their office. They said they came to see Sheldon but after they saw he didn't explode yet, they turned to Marc and talked about his book and his achievements. On Tuesday Marc Stapeton corrected an error on Sheldon's whiteboard.

At 5 p.m. Sheldon knocked on Penny's door at his usual way.

"Come in!" she shouted.

"Penny" Sheldon started as he stepped into the apartment. „How many times do I have to tell you that it is highly unsafe letting someone in your apartment without asking his identity?"

"Sheldon, what do you think, how many persons knock on my door shouting out my name three times in a row?" Penny's voice came from her bedroom. "Anyway, I can recognize your voice from a thousand others" She said and stepped out the bedroom. She wore her cute blue mini-dress and she was combing her hair.

"I see your point, but..." He silenced when he saw the girl. "Why do you dress up like this for a Tuesday evening?" He asked suspiciously.

"Because I have a date" Penny answered with a bright smile.

"A date on Tuesday evening? Penny, you know that I have dinner at the Cheesecake Factory on Tuesday and you have to deliver my barbeque bruger." Sheldon stated and looked at the blonde reproachfully.

"I'm sorry, honey, but I'm free tonight. Nina will serve your burger."

"Did you explain to her the exact process of the making and delivering my burger?"

"Yes" Penny lied without flinching.

"Anyway, I don't understand how can you go to a date on Tuesday evening when you know you have serious duties." Sheldon continued.

"Because someone asked me out and I accepted it."

"Who?"

"Your colleague, Marc" Penny answered while she went back to her bedroom.

"Dr. Marcus Stapeton?" Sheldon asked and wove his arms in front of his chest.

"Yes" she said as she returned to the room. She looked at Sheldon's confused face and continued. "You know, the man you share a room with now and who believes the exactly same science-stuff like you but he makes money from it."

"Because he prostitutes it" Sheldon stated. "And we don't 'believe' in the exactly same stuff. He is a bosonic type, he thinks that only bosoms and no fermions means only forces which is absolutely false because of the…

"Bore." Penny stated and Sheldon silenced. "Anyway, why do you come to me?" She asked.

Sheldon's face paled a little but he take a deep breath. "I'm going on an experiment and I need more data so I have to ask a favor from you."

"Does it involve bugs?" Penny asked suspiciously.

"No."

"Spiders?"

"No."

"Electrodes?"

"Not this time." Sheldon assured.

"Ok, then I think you can ask me." Penny said with a bright smile.

"Kiss me." Sheldon ordered shortly.

"What?" Penny eyes went extremely wide and she was confused and she waited for her neighbour's well-known 'Bazinga'. But she waited in vain.

"You've heard me. I need you to kiss me. Again."

"Why?" It was the only question she could ask in this situation.

"Penny, you know that I am probably a precursor of a new human species, the Homo Novus. I am aware that this new race is above human touching but my body was in this strange state after you've kissed me on Saturday night,…"

"Okay, stop." Penny shouted. Sheldon looked confused so she continued in a softer tone. "I'm sorry for that kiss. I know I didn't have to lay into you but it just felt so right at that moment. I… I…" she looked like she begged "I don't want to hurt you or make you feel awkward. I promise it was a one-time thing and I never ever…"

"Penny" Sheldon interrupted. "It was good. I want to repeat it."

"What?" Penny shouted. They were staring at each other, Sheldon waiting while Penny couldn't believe in what she'd just heard. Then someone knocked on the door. Penny roused at the voice.

"It must be Marc." She said quietly and she opened her door.

"Hi" Marc greeted. He wore jeans with a shirt and a business coat. "I bring you this." He said and he gave Penny a small bunch of roses.

"Oh, hi" Penny said still stunned by Sheldon's words. "Thanks for the flowers. Come in while I put them into a vase."

Marc stepped in and he noticed Sheldon.

"Dr. Cooper?" He asked strickenly.

"Dr. Stapeton" Sheldon said and looked down to the floor. Penny could feel the tension between the two men. She quickly put the flowers into a vase and went for her jacket.

"I hope I don't interrupt anything important" Marc said looking at Sheldon with a smile.

"Oh, no, it was a just... Sheldon has asked me a favor" Penny said quickly.

"Yes, I needed more data for one of my experiment, but I think I can continue it without Penny's help" Sheldon said looking at Penny with a little disappointment.

"We'll talk later, Sheldon." Penny said while they all left the appartment.

"Of course we will. We live across from each other. It's inevitable to meet and talk to each other from time to time. Have a nice evening" Sheldon said and rapidly disappeared behind his own apartment.

Penny was confused. She didn't understand Sheldon's behaviour but she worried about the disappointment she had seen in Sheldon's eyes. She was wondered if she had to go after him right now to find the answers to her questions.

"Are you ready for a night with one of the most beautiful mind in this country?" Marc asked.

Penny smiled. "Yeah, let's go." She thought that she was taken around with beautiful minds and sometimes she just couldn't understand them at all.

The other beautiful mind in apartment 4A went to his desk and wrote a note in his notebook. He knew he couldn't get any more information from Penny, so he had to ask somebody else. He decided that tomorrow he would ask Amy Farah Fowler.