"Cas I don't get it." Dean threw aside a textbook in frustration and groaned, since discovering they would be working together Dean and Castiel had been spending an extended amount of time together, Castiel would never tell Dean that he secretly liked the time they had together, and missed him if they were apart. He had become very aware of his attraction towards Dean. His heart still jumped in excitement at the prospect of seeing him even if it was for a limited time. At school Dean and Castiel travelled in very different social circles all of which Dean was easily able to integrate into. "What do you mean?" Castiel picked up the discarded textbook placing it on the pile that he had already dubbed the 'Reject Pile.'

"What do you not get?" Dean sighed while lying back on his bed, rubbing his eyes and yawning. Castiel watched as Dean closed his eyes briefly his face peaceful. He had always wondered what a peaceful face looked like and seeing it it was nice. No trace of the strains and stress of life. "I don't get science." He murmured softly. "If it any consolation I am not very good at science either." Dean's lips perked as his eyes opened. "Really? And here I thought you were a nerd." Castiel rolled his eyes while picking up another book and passing it to Dean in the hopes he might find something relevant. "A nerd? No, I do not believe so." A snort was the only answer he got from Dean as he flicked through it a bored expression on his face. "Y'know you're probably right about the nerd thing." He turned his head to find Dean staring at him his eyes hot and dark. "After seeing your room and the 'organised chaos' just doesn't really shout nerd." He of course tried his best to understand the conversation sometimes he found himself fighting his confusion when Dean spoke about irrelevant subjects. He felt Dean cup his chin with his fingers, lifting and turning his face to him. "Your like one of those Angels… umm y'know the fallen ones?" even with his throat dry Castiel cleared his throat trying his best to ignore the heat. "The ones who've ripped out their Grace and fell to Earth." Dean finally concluded his eyes still carrying the heat as Castiel's reflected his stunned reaction to Dean remembering a conversation they had had out of boredom. "H-how do you mean?" Castiel's voice cracked under the pressure. "Because it's like you're trying to learn how to be human."

Did he feel what Castiel did whenever Dean was close to him? Was that fire in his green eyes the answer to his mental questions? "Don't look so surprised Cas." Dean leaned in their lips inches apart; Castiel could almost taste Dean's breath and resisted the urge to wet his dry lips not knowing what could happen. Dean's hand moved from his face tracing a heated path to his neck and fingers teasing the dark hair at his neck. "I'm pretty good at reading people, and I have a feeling I know exactly what's going on in that head of yours."

A serious of events leading to one big final showdown that brought two people together. One small movement brought their lips together; the shock of their flesh finally touching ignited the fire in his body. The kiss was sweet and easily described as polite but one simple turn made it deeper and passionate. There were so many different thoughts going through his head as he mimic the movements and slowly allowed his lips to part and felt the liquid heat of Dean's tongue slip into his mouth.

As Dean pulled away a small-satisfied smile forming on the lips that had just kissed Castiel, without knowing it would be his first. A small pink flush had spread across Castiel's cheekbones warming his bones and skin to the feeling of melting. Castiel lifted a shaking hand and touched his lips, still wet from the contact, hot from the reaction and swelling from the pressure. Dean leaned forward placing their foreheads together keeping the contact, as Castiel was still stunned from the events. "Maybe we should do our Biology project about the Human Body's Reactions to different scenarios."

"Would that be wise?" he whispered feeling Dean's hand move to his neck, and stroking the soft skin. "You've had first hand experience with one already. So why not." He felt Dean's fingers stroke his hair; a simple gestured that had always successfully soothe and calmed him. "It'll be easy," Dean replied back as he placed his lips again on Castiel's. "Describe and explain what happens and how the body copes with different… situations." He breathed while pressing small kisses on Cas' jawline until he was at his ear. "Like when you're scared your heart beats faster and breathing gets deeper and harder." He pressed a kiss against his racing pulse. "The same could be said for when you're nervous or aroused."

Dean did nothing but kiss Castiel, pressing kisses on his neck murmuring suggestions. "And we can look into animal attraction and instincts." His fingers still stroked Castiel's hair until he pulled away taking him the sight, Dean gently took one of Castiel's arms and pulled back the sleeve revealing the scars, small shots of panic ran through him. "No please don't." He stared into Dean's eyes the intensity overwhelmed him. "Don't worry, everything's going to be alright." His pressed his lips against the worst of the scarring. "They are part of you, and I want to know everything." Castiel tried not to flinch as Dean's lips moved up his arm whispering at each kiss. "Every scar and every memory."

He had no idea how long Dean explored his arms before moving back to his neck and face, but his body yearned whenever the lips left his skin. A small knock broke through the heated thoughts his brain was trying to translate. Dean continued kissing his skin only stopping for a moment to reply. "Yeah?" he nuzzled the skin affectionately as Sam's voice came through the door. "Dean. Dad's home."

A/N: ... ... ... I really don't know what to say, I am actually repressing fangirl giggling!
;) ... O.O