Disclaimer: I don't own Star Trek or profit from this drabble.

Summary: McCoy's tests prove Spock and Jim have a souvenir from his last Pon Farr.

It's slash, but nothing graphic.

Souvenir

Sitting quietly on the examination table, Spock waited patiently for Dr. McCoy to disclose his medical test results. The slight flutter in his stomach grew with each second that elapsed without the knowledge he so desperately craved. Taking several deep breaths, Spock relaxed into a light meditation state. The Vulcan rarely visited the Med Bay for normal physicals. Even more rarely did he seek out medical advice first without being prompted by McCoy. It had been a mere three months since his last visit, to confirm his hormone levels were once again normal after the calming of his Pon Farr.

Exactly 9.4 minutes after he had left, McCoy once more entered the private bay with a look somewhere between awe and excitement across his human features. "Well, Spock, I have been a doctor for nearly twenty years, and never before have I had the pleasure of announcing such an anticipated arrival." He smirked; Spock fought the urge to roll his eyes. His emotions were closer to the surface these last few weeks than he was accustomed.

Spock merely raised an eyebrow, the textbook example of Vulcan emotionless demeanor. "There is no need for much dramatic announcements. I conclude the tests were positive?" Spock stood from the bio-bed in one easy movement. His voice was steady and calm, but happiness bloomed within his chest.

McCoy shook his head. "Leave it to a Vulcan to suck all the fun out of every little thing. Yes, the tests were positive." He paused as the Commander pulled his blue tunic down over his lithe form. "You will inform Jim of this, won't you?" Expectancy filled the physician's voice.

Tugging down on the seams, Spock faced McCoy. "I have no intentions of keeping this revelation from the Captain. However, I do think it prudent to keep this from the rest of the crew, for the time being." A silent exchange of understanding passed between the two men.

McCoy stood up to his full height, smiling softly. "I do believe congratulations are in order." Warmth and understanding radiated form the shorter man.

Thankful for his understanding, Spock dipped his head. "Thank you." He was indeed proud of this newest development.

As Spock turned to leave, McCoy cleared his throat. "Spock, as I am your physician, I would like a little clarification. I will have to report this to Star Fleet Medical and the Vulcan Population Division as per protocol, but I would like an explanation on how the male Vulcan Commander of the Enterprise has been impregnated by his male Human Captain. For all my medical knowledge, I am at a loss." He ran his hand though his hair in obvious discomfort from the delicate situation as well as his lack of prior knowledge this was a possible outcome of Spock's natural biological evolution.

The scene before the Vulcan was quite comical, he was sure his human mate would have laughed out loud. However, McCoy was not only a close friend to Jim; he was also a close friend to Spock and as such deserved an answer. "Pon Farr for Vulcans is a time of mating." He received a dead-pan look from McCoy, but he pushed forward willingly divulging the information. "If the mate of the effected is a male, it is not uncommon for conception to occur during the Plak Tow, for at that time is the male body most receptive for reproduction. Some cases report that both males conceive if the situation allows." A slow mint blush spread across his high cheek bones as he described a very personal and private experience to the physician.

McCoy was closely following Spock's explanation, his eyes glazed over in comprehension. After a few moments to digestion the information, McCoy glanced worriedly at him. "But only Vulcan males will conceive, not human?" He was unsure in his question.

The corners of Spock's mouth curved up minutely. "Not human." McCoy sighed in relief. "I do not believe that while Pon Farr is a great force amongst the Vulcans that it can change the anatomy of a human male." He admonished his friend.

McCoy blushed. "I just wanted to make sure, stranger things have happened." They both remembered some of the strange occurrences of the past few years. "So, I can't wait to see what Jim has to say when he learns about your souvenir from Pon Farr." Grinning as only a father could, his eyes twinkling at Spock welcoming him into the elite rank of fatherhood.

For a moment Spock's heart stopped beating, or atleast that is how it felt to the Commander. "I certainly hope Jim is pleased." His tone was hollow.

Stepping closer, McCoy placed a comforting arm on Spock's shoulder. "He will be thrilled, I promise." He moved aside to let the Vulcan pass, effectively dropping the issue. "Spock, let me know if you need anything. I want weekly check-ups to monitor your condition." Worry filled the older man's eyes.

Spock nodded, genuinely surprised by McCoy's concern, and left the Med Bay. Though it may be illogical, Spock was nervous of explaining the reason and the result of his frenzied mating with Jim. Children had never been discussed. He did not doubt that Jim loved him, but he might not be prepared for the changes to come.

A/N: Thanks for reading

Yea, I've gone completely off the deep end. I am not a usual MPreg shipper, but I was thinking about Pon Farr. (So please read before you flame) I know that it's left over from their ancestors, but why would a male have a crazy sex drive that didn't necessarily coincide with female conception? No where is it listed Pon Farr has any correlation with Vulcan babies. So this idea was born.

Like it? Love it? Hate it? Please drop me a line and let me know.