Disclaimer: not mine
The mistakes are...

After pulling up across the car from the Benny's Diner they had picked, Harm climbed out of the car and turned to find Mac hadn't moved and had a rather unimpressed look on her face.

Quickly, he rounded the car to her side and opened the door.
"If you don't want to eat here we can go somewhere else," he suggested quickly.
"What's wrong with here?" she asked, looking up at him.
"Nothing," he answered. "It's just that you didn't look too impressed just now."
"Oh," she replied. "That has nothing to do with the diner."
"Then what is it?" he probed as he took her hand and helped her from the car.
"You never kissed me goodnight after our first date," she said with a pout. Harm smiled. "And that's supposed to be a special kiss."
"Is it just?" he asked as he stepped towards her.
"It is." She nodded. "It's supposed to show whether or not we are compatible."
"I think we proved we were compatible during the date," he countered, "very satisfactorily."
"Oh," she said with a sigh.

Harm took in her appearance and decided that her pouts and sighs were borne of a true disappointment… that she wasn't trying to be coy or playful, that she indeed had anticipated a kiss goodnight.
"You know," he started as he ran his hands up and down her arms. "If I had of taken you home last night, I would have kissed you goodnight… it is something I have thought about often."
"Really?" she questioned as she looked up at him with doe eyes.
"It is," he confirmed.
"How?" she questioned.
"Well, first I would have taken a small step forward," he began, his actions imitating his words. "And then I would have tenderly stroked your face. If I saw you were happy with that I would have leant forward and gently kissed you." Harm placed a featherlight kiss upon her eager lips.
"And then?" she asked when her eyes opened.
"Well, it was only a first date, I wouldn't have wanted to be too forward," he said as he linked his arms around her neck.
"What if I had wanted you too?" she asked wrapping her arms around his waist.
"Then I would have continued," he said and she smiled. "I would have placed at least a dozen soft kisses across your cheek and your lips…" He did so. "And the last one would have just a little more force than the others." He kissed her a little harder. "If you reciprocated I would have deepened the kiss and waited for your permission to continue."
"You'd have had it," she said, holding him tighter.
"Then I would have used the tip of my tongue to gently brush across your lips and…"

Any further narration of the kiss was curtailed when Mac raked her fingers through Harm's hair and then used her new position to continue the kiss. True to his words, Harm's tongue danced delicately along her lips until she opened her mouth and it slipped inside. There he began a slow and methodical exploration of her mouth and tongue which left her breathless and weak at the knees.
"And that's how I would have done it," he said as he finally pulled back and watched her glazed eyes.
"I would have liked that," she replied, her lips swollen.
He quickly kissed Mac again before taking her hand and leading her into the building.

Sitting opposite of Harm in a torn red leather booth at the far side of the diner, Mac leant on the table and just looked at him. He was indeed gorgeous and the sparkle in the still sleepy blue eyes made her stomach flutter.

"See something you like?"

Mac was just about to reply with something very suggestive when she realized the question had come from the waitress who had given them menus earlier.
"Ah, the full breakfast with black coffee," she said quickly.
"I'll have the vegetarian omelette with wheat toast and an apple juice, thanks," Harm said, handing back both menus.

Once the waitress left, Harm reached over and took Mac's hands in his.
"That wasn't your first thought, now was it?" he said slyly as he raised an eyebrow.
"Whatever do you mean?" she asked with an impish smile.

Harm grinned at her playfulness. This was the woman he had fallen in love with…the one he wanted desperately and forever more and, he vowed to himself, he wasn't going to mess this up.

Chatter between the pair was hushed but continuous and, except for the occasional laugh, the waitress and other diners couldn't hear what was being said but it was clearly evident from their faces and body language that the two were deeply in love and it wasn't something that was new either.

By the time their meals arrived, Mac had moved around the table and slid next to Harm, thoroughly enjoying that she could touch him and kiss him anytime she pleased. It was the waitress' cough which told her breakfast was ready and that she wasn't overly happy with their antics, but Mac didn't care, not in the least.

With neither having eaten much for dinner, their food being forgotten in pursuit of a long make out session that would do any teenager proud, both devoured their food in near silence. As he ate the last of his toast, Harm was trying to figure out how to prolong the date but as Mac yawned for the third time in five minutes he had to concede that perhaps he needed to take her home to bed…to sleep of course as this was only the second date…unfortunately, he thought to himself.

The walk up to Mac's apartment was slow and both were rehearsing what to say and do when they finally reached her door. As the dreaded moment arrived, Mac slid her key into the door and opened the lock before turning around. As she did, Harm surprised her with a very deep, thorough kiss which left her pulse racing and her cursing she had insisted on three dates.

"What was that?" she asked, trying to play for time.
"I was kissing you goodnight…properly," he added with a grin.
"But you weren't supposed to," she said with a frown.
"Why not?" Harm questioned, more than surprised at her response.
"Because, while you did drive, it was me who invited you on our second date. Therefore, it should be me kissing you goodnight," she said resolutely.
Harm chuckled. "Well, what are you waiting for then?" he challenged as he took her hand.

Mac glared at him for a moment as her brain ticked over wildly, trying to come up with a kiss which would see him melt into a puddle; the same effect he had on her. When the moment of inspiration struck, she stood on tiptoes and kissed him lightly on the lips before saying goodnight and heading inside her apartment.

This sudden turn of events had alarmed more than surprised Harm. He had been anticipating a more heated exchange and perhaps an invitation inside or, at the very least, plans for their third date. Mulling this over as he slowly descended the stairs, Harm shook his head, trying to figure out whether he'd done or said anything which may have caused Mac's flip in behavior.

Sitting in his car still trying to figure it out, Harm was disturbed by the ping of his cell telling him he had a message. Briefly glancing at it, he saw it was from Mac and quickly pressed 'read'. His blood ran cold when he saw her short message; '911'.

Out of the car, Harm climbed the stairs three at a time and arrived back at Mac's apartment breathless and panicked. This sense of panic increased dramatically when he realized her door was open.
"Mac! Mac?" he called as he ran into the living room and flung the door shut behind him. "Mac!"

Appearing in her bedroom doorway, Mac, who had changed into a red lacy camisole and panties set, leant back against the jamb. Harm instantly crossed the room towards her, stopping about a foot away.
"911?" he asked almost breathless, holding up his phone and trying to focus his eyes on her face and nowhere else. "What's the emergency?"
"I wanted to see you," she said with a playful shrug.
"Couldn't you have said that?" he asked, waving the phone once more.
"911 was quicker… and, anyway, I needed you in a hurry," she admitted with a grin.
"And what do you need me for?" he asked, not daring to step any closer.
"Well, my bed is very big…and cold … and lonely," she said with a pout.
"Are you inviting me in?" he asked gesturing towards her room.
"I am," she said with a nod as she reached out and started unbuttoning his shirt.
"What about your third date rule?" he asked as she pushed his shirt off his shoulders and onto the floor.
"Who said we'd be having sex?" she countered, stopping her undressing of him.
"Well, I thought…" he stammered. "It seemed…" he stopped, not knowing how to explain himself.

Mac laughed heartily at his stricken expression and decided to take pity on the man in front of her.
"Actually, you're right," she said. "We will be having sex in there," she said matter of factly. "If you want…"
"Oh, I want," he agreed as she led him into the room. "But I ask again, what about your third date rule?"
"I think it's very overrated," she said as she undid his jeans and pushed them down.
"Me too," he agreed as he toed off his shoes and shucked off the jeans.

Truth was Mac was usually very strict about the third date … well, since she had joined the marines she had been. However, with Harm she was prepared to make the exception…and every other exception needed to make this encounter possible.

With a little force, Mac pushed Harm backwards so he was sitting on the side of her bed. Stepping in, she ran her hands from his face to behind his neck and clasped them together. Immediately, Harm wrapped his arms around her waist and pulled her towards him. Reaching up, Harm gazed into her eyes and waited for her to lean down to kiss him – something which didn't happen.

Instead, she stood still and stared at him and soon he found it rather unsettling.
"Something wrong?" he finally asked, holding her a little tighter.
"Um, no," she answered in a whisper.
"Um, no?" he echoed. "You don't sound too convinced."
"I'm okay," she said, her voice a little shaky.
"Mac?" he drawled, watching every flicker of emotion play across her face.
"Sorry," she said, dropping her head before leaning into him.
"What are you sorry for?" he asked, pulling her closer still, his hand rubbing small circles on her back.

Shaking her head, Mac couldn't come up with an answer. The fact was she was battling a sudden onslaught of nerves and although she wanted this more than she had wanted anything in a long time, her heart was beating so fast she wasn't all too sure she wasn't going to pass out.

Feeling the rapid pounding of her heart against his skin, Harm had some idea as to what the problem was and felt somewhat relieved she seemed to be as nervous as he was.

Pushing himself up from the bed, Harm held Mac close and kissed her head.
"Do you know how much I love you, Mac?" he asked as he kissed her cheek.
"Aha," she replied, shyly looking up at him.
"You are, without a doubt, the most incredible person I know," he continued as he kissed her again. "You are so beautiful, inside and out …"
"I love you, Harm," she said as she finally found her voice. Reaching up her lips found his and soon they were locked in a vigorous kiss which saw Harm fall backwards onto the bed, bringing Mac with him.

Soon, all items of clothing were divested and thrown to all parts of the room and they were shrouded in the queen sized blue quilt. Harm's lips soon left Mac's as he begun a detailed investigation of Mac's body; delighting in every curve and crevice he encountered.

For Mac's part, she was more than enjoying this brand new aspect of their relationship. However, she soon discovered that if things didn't progress beyond foreplay very quickly she'd explode.

Tugging on his arm, Mac drew him back up before kissing him soundly.
"Now," she said breathlessly.
Harm's eyes darkened as he took in her flushed face and swollen lips; she was the epitome of desire and he couldn't really believe this was actually happening. It was a painful realization to him that he was not prepared for this encounter, protection wise. This halted proceedings.

"What's wrong?" Mac asked, concerned at this pause.
"No protection," he admitted as his breathing began to slow.
"And?" she pushed.
"Well, I just thought… I didn't want to assume…" he began and Mac laughed.
"I want you, Harmon Rabb…all of you," she added, breaking another of her own rules.
"Only if you're sure," he said more than relieved at her reply.
"Absolutely positive," she said, after all she knew they were both clean and they both wanted a baby, even though the odds were incredibly small.

After that, talk ceased in favour of using their mouths in other pursuits. As Harm moved on top of her, Mac took a deep breath and waited for their most intimate connection. When it occurred her eyes rolled and brain spun. This was Harm and he was actually inside her – she was dizzy from the mere sensation.
"You okay?" Harm asked as he held his weight on his forearms and feet. He had done enough reading over the years to know that Mac's condition often made sex a painful experience and he didn't want her to feel anything but pleasure.
"More than…" she replied, her hands slipping down to his six.
"You'd tell me…" he began and she nodded.
"Right now, everything's perfect," she said with a grin before thrusting up and encouraging him to continue.

Happy with her reply, Harm recommenced his actions. In a dance as old as time, they were soon moving in harmony and it was as if they had been doing this for a life time, and perhaps in some sense they had been.

Mac had climaxed twice before Harm did and as they lay entwined, their sweat slicked bodies fastened together, she sighed dreamily. It had taken so long to get to this point; to feel absolutely content and satisfied with her life. She couldn't imagine what the future would bring. However, as she conceded to herself, all that mattered was that they were together.

"You happy?" Harm asked, caressing her face.
"Blissfully," she replied with a grin. "You?"
"Absolutely," he replied, leaning down and kissing her once more.

As her eyes fluttered closed, Harm smiled and thought of the small blue box burning a hole in the pocket of his jeans. He was desperate to place that ring on her finger, to declare to the world that she was his…and he was hers… to start the rest of their lives in a formal and unified way… to spend his days and nights living with her, living for her, loving her.

But, as she drifted off in his arms, he realized that proposal could wait until later. What mattered, at this very moment in time, was that Sarah MacKenzie was blissfully happy, fully content, in love with him and trusted him implicitly and with those wonderful thoughts meandering through his mind, he too fell asleep wrapped in her arms.