Disclaimer: I own Death, but not the Grim Reaper or any of his slave-drivers. Nor do I own the series about them called The Grim Adventures of Billy and Mandy. Some man named Maxwell Atoms owns that. I also don't own Harry Potter, but I do own one copy of each book.

A/N: I know I'm loading my plate to the ceiling, but I'm just so hungry! I started this story last year, but I never got around to uploading it. Well, here it is: my very first crossover.

Mandy and Grim were sitting at the table in her house one morning, their breakfast sitting before them. Mandy was 18 now, fresh out of high school as of last week, and on her way to world domination.

"- kids, Mandy," Grim was saying, "Why would your mom ask you that?"

Mandy shrugged. "She's so bored with her own life that she has to meddle in mine. It doesn't make any sense, though. She didn't even want me. Why would she ask about grandchildren?"

"Maybe she wants them now," Grim guessed.

Mandy shook her head, "She's young enough to have more, but she's not stupid enough. Look at the way I turned out. You think she'd make that mistake again?"

Grim shrugged, biting into his Wheaties. "Who would you even make babies with?"

"My husband," she replied in her most condescending tone.

"Yeah, I know, but –" Grim struggled to phrase it in a way that wouldn't get his head smashed in. "I mean, who would you marry?"

"I have a type, Grim," Mandy replied.

Grim asked incredulously, "You do? Since when?" Mandy shrugged. "What is it?" Grim asked.

"I like my men a little on the tragic side."

"What do ya mean?"

"They have to have a history with death. It has to be a major part of who they are."

"Go on."

"I want a man who's tall, who has dark tastes in clothes."

"Such as black robes?" Grim asked.

"Precisely. And he must be very powerful, but I have to be the dominant. And I like a man who's clean-shaven, preferably with no hair at all," Mandy remembered Irwin, and added, "And white."

"Can he have an accent?" Grim asked, intrigued now.

"I'd like that."

Grim smiled. "I might have just the man you are looking for. Are you free this afternoon?"

Mandy nodded. "It's summer. I don't have a job, and there's nothing to do in this dumpy town, anyway."

Grim stood from the table. "Alright, I'll set up a date. You do whatever you need to get ready, and I'll take care of the rest. This'll be fun!" He laughed delightedly and disappeared to prepare for the date.

That night, Mandy waited in her room for Grim to send her the address of the restaurant the date would be at. For surprise's sake, he wasn't going to pick her up. It would be a blind date. He didn't want her to know who the man was, but if Grim had any brain in his skull at all, Mandy thought, he would have picked exactly who Mandy was talking about, so Mandy would already know. How many men, after all, could fit that exact description?

She drove herself to the place. It was the nicest restaurant in the area, and Mandy was a bit surprised that Grim was going this far to make her first date an almost perfect one.

Mandy walked into the room, and all the noise ceased. She looked better than a movie star in her blue sequined dress and matching pumps, her glamorous make-up highlighting her beauty so radiantly that she put America's top models to shame. She strode confidently into the place, letting her eyes slide across the faces of the stunned men gazing at her, straightening their suits and hair in attempt to win her company, but Mandy only sought one man.

"Mandy!" Grim called from a corner booth, and she followed his voice there. Things were going great until she noticed the other man in the tux standing beside Grim. This man was familiar to her, but she knew that she'd never seen him before. Still, she knew she knew who he was, she just couldn't place him. "Mandy, this is Tom Riddle," Grim introduced them. "You may know him by a different name."

"But I don't use that name in front of beautiful women." Tom's charming smile went with his young face. Realization dawned on her. She remembered him in a different face, an older, eviler face. She couldn't decide which she'd prefer, but right now she didn't want either.

"What's this, Grim?" she asked, crossing her arms.

"He's exactly what you described. Well, on a normal day, I mean. Right now, he's wearing his other face because I thought that would be more socially acceptable. But his normal face doesn't have a nose! You two are perfect for each other."

Mandy rolled her eyes, then took a seat opposite Tom Riddle. Tom stuck his hand out to her. "It's a pleasure to meet you, Mandy."

"You're only saying that because Grim brought you back from the dead to do this."

He grinned guiltily. "That's not the only reason. You are very beautiful."

"Well, just like you, I'm wearing my other face," Mandy admitted.

"Well, I can't wait to see all of your faces," Tom replied.

Mandy eyed his persistent hand, took note of the firm, strong muscles beneath the smooth, creamy skin that somehow managed to look elegant and masculine at once. Decidedly, she slipped her petit, feminine hand into his. Tom brought it to his face and grazed his lips across it, sending a wave of gooseflesh up her arm which she quickly subdued with the unspoken threat of amputation.

Grim shifted uncomfortably as he watched this transaction. "Well, I'll leave you two alone now. Give me a call if you need me."

"See ya, Grim," Mandy dismissed.

Grim hovered for a moment more, then walked outside where he made a portal and went back to Billy's basement. He opened his trunk and pulled out the scrapbook he kept of his child-captors, hoping to settle the uproar his feelings were raising.

He had been with these kids for seven years now, and there had never been a boring day. He flipped through the first year of their "friendship" where pictures of monsters they'd battled filled the pages. The zombies had been a particular experience he liked to revisit, mostly because those brownies Billy had baked were delicious. He flipped through the pages, through years 2, 3, 4, 5, and 6. He stopped in the middle of the sixth section, studying the pictures carefully. Things were much different here from the first section. Everyone seemed happier, seemed to be having more fun with each other. Where in the first section there had been pictures of Mandy torturing Grim, now there were more pictures of Grim and Mandy together enjoying each other's company. About here was when the pictures of Billy began to thin in number. By year seven, which was only partially complete, there were barely any pictures of the red-haired oaf.

Grim shut the book, grimacing as he came back with the same result as always. He knew it wasn't right, but he couldn't help it. Seven years was a long time to be stuck with someone. He thought, once more, that he should seek help for his feelings, but he was too embarrassed to admit such things to people. Besides, he didn't have anyone he could trust to keep the secret.

A couple of hours later, Grim had still not received a call from Mandy, and he was getting anxious. He dashed over to the restaurant and, finding them absent, decided to drop by her house. He hopped into a blazing green portal and reappeared in her yard. When he opened the front door, he found Tom and Mandy sitting on the couch, deep in conversation.

"How'd you get here?" Grim demanded.

Mandy glared back at him. "My car. Duh, Bonehead."

"Next time, I'll give you a ride on my broom," Tom offered, "It's a Rapidus 2012. I always get the newest model every year."

Mandy shrugged. "I haven't ridden a broom in a long time. It could be fun."

Fun? Grim thought in puzzlement, Mandy never has fun at home.

"Well, I guess that means it's time for me to leave," Tom said, glancing at Grim for affirmation.

Grim nodded, and Tom stood, offered Mandy his hand and pulled her to her feet. He walked her to the door, leaving Grim waiting silently in the living room. The couple stood in the doorway, staring at each other. Tom reclaimed Mandy's hands and smiled. "We'll have to do this again sometime," he insisted, commanding his words to coil around her like wisps of sweet butter.

"I'd like that," she replied.

He brought her hands to his lips and kissed her fingertips. Then he departed into the night. Mandy let her eyes linger on his diminishing silhouette, then closed the door and sat back down on the couch.

"So?" Grim prompted, helping himself to the cushion next to her.

"What are you, a sixteen-year-old girl?" Mandy sneered, though not as harshly as usual.

"Come on, mon. Indulge me a little," Grim begged.

Mandy peeled a glove off slowly, then the other before answering. "He was nice."

"Nice?" Grim asked, twisting his skeletal lip upward. "He's the Dark Lord."

"Well, maybe that's not the right word. The point is, I like him. As you said, he is my type."

A/N: I hope you weren't expecting canon, because I'm not going to give it to you. I'll do my best with Mandy, but Grim's character will be affected.