Takes place three years after the promised day, where Roy and Riza go undercover as a married couple to investigate/arrest a serial killer.

Funny how in the English fandom, Riza is three years (or less) younger than Roy. In the Chinese fandom, Riza is four years younger than Roy. And in the Japanese fandom, she is five years younger than him, one year younger than all the 2nd lieutenants (Havoc, Breda, Ross, etc).

So, I'm gonna go according to the Japanese fandom, where Roy is 33 and Riza is 28 in this fic.

Boring start, characters can be a bit OOC, but hopefully it gets better (?)

Enjoy!

Chapter 1

Captain Riza Hawkeye knocked and entered the Führer's office. She raised her right hand to a crisp salute, "Führer Grumman." Her eyes swept across the room, "… Brigadier General."

"Captain." Mustang gave a nod as an acknowledgment with a slight surprised expression across his features as he turned around slightly from his seat to advert his attention from chess to his adjutant.

"Ah, Riza dear. Just on time." Grumman waved his hand slightly at his granddaughter.

"You called for me, sir?" Hawkeye raised an eyebrow.

Grumman frowned slightly, "Come on, Riza. Don't need to be so official with your grandpa." He looked up to see her looking blankly at him, so he gave a cough. "Ahem, anyways, I have a little task for you to do. It involves you too, Mustang."

"A task, sir?"

Grumman let out a sigh. "There's been a serial killer on loose in West City. I'm sure you two are aware of that."

Riza grimaced. For the past month, she has already read six newspaper articles on the killer, where he rapes and brutally kills six young women by stabbing them over and over again in the stomach, leaving the MPs to discover them having their guts spilt and limbs severed. She involuntary shivered slightly.

Mustang eyed his blonde adjutant with a worried glint in his onyx eyes. "Captain?"
Riza glanced at her superior officer and lowered gaze. "Apologies-" Her eyes then snapped wide in realization. "You want me to go undercover."

Mustang's eyes started to widen too and he clenched his fists, his nails digging into his palms.

She saw the apologetic look on her grandfather's face. "All his targets are blonde women, age ranging from 25 to 29. And you happen to fit in both categories. I'm sorry Riza-"

"I understand. I'll go."

Mustang gritted his teeth, his nails digging further in his palms, drawing blood. He wanted to lash out, to scream at the old coot, to slap some senses into Riza and run away with her where no one can find them. But he couldn't. He knew the consequences well.

"And? How does this mission involve the Brigadier?" Hawkeye asked.

"Right." Grumman said slowly while eyeing Mustang carefully. "I want you two to go undercover as a married couple."

Hawkeye walked two steps behind Mustang and stared at him intently while her mind flashbacked through the events that happened ten minutes ago.

"M-married couple?" Mustang stuttered while Hawkeye looked flabbergasted.

"Yes, married couple. It's one way to keep Riza safe, and according to all victims' family, they were all married; therefore it is also a way to lure the killer out. Speaking of which, we already have a suspect."

"If you already have a suspect, then why didn't you do anything about it!?" Hawkeye roared and startled Mustang, as she was unable to contain her bubbling anger. "When did you find out about the suspect?"

"After he killed the fourth victim." The Führer replied grimly.

After the fourth!? "Then you let two people die when you could've prevented it!" Hawkeye slammed her fist onto the table. "Grandpa, what the hell were you think-"

"Captain. Calm down." Mustang placed a hand on her shoulder and flinched a bit when she turned to glare at him.

She huffed. Grumman continued, "The suspect is a relative, actually, brother of a military general of Creta which is suspected of kidnapping and human trafficking. We couldn't arrest the serial killer because firstly, he would cover up the evidence, and secondly, his brother would get him away with his authorities as a general. Only a few people know that you are my granddaughter, and Mustang, not a lot of people recognize your face. So you two undercover as a married couple, Roy and Elizabeth Grumman, in West City to arrest the killer; and then you two go to Creta to attend the military ball as representatives of Amestris to arrest the general, we have enough proof for his crime. I have a house in West City so you two can live there during the mission. You leave tomorrow morning, don't worry about the paper work you haven't done yet."

"…Understood, sir." Mustang said. "What's the suspect like?"

"The name's Damon Dubois, his brother is General Damian Dubois. Both have platinum blonde hair with facial hair and pale blue eyes, while Damon has a tattoo of an angel on his left arm. Do be careful during the mission, General Mustang and Colonel Hawkeye."

Hawkeye gave him a stunned look. She choked out the word. "C-colonel?"

"Yes, Colonel. Both of you and your team did well for rebuilding the Ishval region and trading with Xing. I've wanted to promote you two, and now is the best time to do so. By the way, the rest of your team would be promoted two ranks higher than before. Honestly if I could, I would promote you to General too, Riza." Grumman grumbled.

Hawkeye sighed. "Grandpa…"

"Well, anyways, good luck with the mission. And don't get too carried away and start making babies when you two live together." Grumman grinned slyly, making the both of their cheeks pink and cough awkwardly.

"Grandpa!"

Hawkeye gave another irritated cough at the words her grandfather said, gaining the freshly promoted General's attention that made him stop his footsteps. "Cap-uh, Colonel? Anything wrong?"

Making babies… "N-no, sir." She replied rather timidly. Idiot! Stop thinking about it! She scolded herself. "Since we are leaving tomorrow, it'd be the best if we go home and pack up for the mission now. It's almost nineteen hours."

His lips twisted into a smirk. "Were you thinking about what your grandfather said earlier, hmm?" Riza scowled at him while desperately wanting to hide her embarrassment creeping up her cheeks. Mustang just let out a light chuckle. "You're right, Colonel. We should leave now.

"Have a good night, General." She saluted and turned to leave but stopped when he called out to her.

"Elizabeth! Care to have dinner with me?"

She shook her head and sighed. "Go ho-"

"I insist." He then grinned. "Are you going to reject your own husband?"

"…Fine."

Twenty hours sharp at my apartment, only after you packed your things. She looked up at the clock as she heard the doorbell ring: two minutes before eight pm. She looked at her outfit, which consists of a beige low cut sweater and a black asymmetrical skirt that goes down till her middle thigh, once more before opening the door to reveal none other than Roy Mustang.

He gave her a boyish grin and raised the red wine bottle and a box of chocolate in his hands. "For my lovely wife," He eyed her casual yet winsome outfit. "Gorgeous as ever, dear."

She gratefully accepted his gifts and mocked a sweet tone that was usually reserved for Elizabeth, "My, how nice of you, darling." She opened the door wider to let him in, "shoes off. Dinner's almost done, I made beef stew, hope you don't mind, General."

"Of course not." He said while bending down to scratch Hayate behind the ears. "You should know that I fell in love with your beef stews since you were eleven, Elizabeth. Can I help?"

"…It'd be nice of you to get the utensils, two bowls and a large plate." Hawkeye replied as she stirred the stew. She pointed at the cabinet above her when Mustang sent her a confused look, he let out an 'ah' and muttered thanks as she ducked slightly to allow him to retrieve the utensils and the dishes. "Just wait outside, I'll do the rest."

Ignoring his pout, she then poured the beef stew into the two bowls and placed six-sliced bread she just toasted onto the plate. "General, wine or water?"

"Wine, please. I'll set the table."

"Thank you." Her lips curved up into a small smile. It felt… nice to be domestic once in a while, to have someone to have dinner with either than Hayate, to be with Mr. Mustang outside the military.

"Cheers." They clinked their glasses, sipped a bit of red wine before placing their glasses down and ate in silence.

"Hmm… I missed your beef stew. This is heavenly." Roy said with a satisfied grin as he finished his beef stew while watching Riza collecting the dishes to wash them.

Riza's cheeks were in tinted pink as she gave him a sweet yet slightly shy smile that made his heart flutter. "Thank you, General."

"Roy."

Riza turned, eyes widening slightly.

"Call me Roy," He declared, his onyx eyes looking deeply into her hazel ones, "We're going to be a married couple in less than twenty four hours, it won't do if you can't even call me by my name." His lips twisted into his trademark smirk and breathed out huskily, "Elizabeth."

"…Roy." She spoke rather bashfully, then immediately turned and half-walk, half-jogged towards the kitchen. Roy involuntarily shivered.

His smirk widened as he stood and followed her into the kitchen. Riza tried to ignore Roy and continued to do the dishes, but tensed when he slowly wrapped his arms around her waist and pressing his lips against her ear. "May I help, my darling wife?"

"Are you drunk!?" She hissed and tried to pry his strong pair of arms off her but her effort was futile. He only tightened the grip slightly while she squirmed in his arms. She sighed and stopped struggling as she realized it was useless, then huffed with irritation clear and embarrassment clear in her voice; "kindly dry the dishes for me then, Roy."

He chuckled and released his grip, not before pressing a light kiss against her temple. "Of course, dear." Then he let out an oof when she slapped the towel onto his stomach.

Author's note: Kinda ended at a bad/awkward place, huh? Nonetheless, please R&R! ;)