A/N: Two updates in a day again?! I forgot to update last night, so you guys earned it. Enjoy!

A Lifetime of Love

~*~PART SEVEN~*~

Sans closed his eyes and imagined the equation for a moment. Numbers, letters, and symbols aligned themselves in order. He began following each step of the process in his head. He scribbled down another set of symbols, letters, and numbers. He frowned to himself. This wasn't getting him where he needed to be fast enough. He wanted the damn answer already.

He backed up and looked at the wall. It was covered in equations and formulas that he and Gaster had worked on together. Luckily, his landlord had approved the whiteboard paint and he could use the entire wall for his work.

He looked up at the knock on the door. His brow bones furrowed; he wasn't expecting anyone today. Or maybe he was. What day was it again?

He sucked in a breath and went to answer the door.

Frisk smiled at him and held up a bag from a local fast food joint. "I know you're not eating, so I brought you food."

He smiled and kissed her before letting her in. "You're too good to me. How did you know I haven't eaten?"

She set the bag down on the counter and turned to him in silence. She stared at him for a moment, waiting to see if he'd remember.

Sans felt like he was missing something important. His brain kept going back to that damn wall. He was so close to the answer.

"I'm sorry, I know I'm missing something." He scratched his skull. "What did I forget?"

"Our date last night." She'd gotten over her anger already after leaving him a colorful voicemail that she knew he hadn't listened to yet. She knew he was onto something big with Gaster and that it was taking up a lot of his time and focus. "And lunch today."

He walked up to her and put his hands on her hips. "I'm really sorry, baby." He kissed her. "Can I make it up to you?"

"You can eat something, for starters." She held the front of his shirt and kissed him again. "Then we'll talk."

He was relieved that she still liked him enough to kiss him. After one more kiss, he pulled back and followed her to the table.

Frisk watched him as they ate. He devoured his burger as if he hadn't eaten anything for two days. She wouldn't have been surprised if that was the case. It seemed adulthood barely fit him. Even at twenty-three, he needed someone in his life to keep him on track. Thank goodness he had her, she thought.

Still, she wanted more than to see him only a few times a week. They had been dating for five years, getting closer and learning more about each other with each passing year. She was ready to take this relationship further.

As they ate, he talked to her about what he was working on. She understood snippets of it, things like how he and Gaster were working on a theory about spacetime and how it related to gravity. Most of it went over her head, but she knew it helped him to talk about it. She loved how enthralled he was with his work.

Once they were finished, Sans all but dragged her into the living room so he could show her what he and Gaster had done the day before. They'd made a minor breakthrough in part of the theory, but they couldn't really get too much further without the other part.

"You realize that this entire wall is just numbers and symbols to me, right?" she asked.

Sans looked at her blankly for a second. "No, it's science."

She smiled. "Gibberish."

He took a breath and reminded himself again that not everyone in the world understood what he was working on. He pulled her close to him and kissed her.

"You're right; we shouldn't talk about my work. What would you like to talk about?"

She ran her fingers up his shirt, making a point to feel each and every one of his ribs as she did so. "What about how sexy I think you are when you're being all smart?"

He grinned. "I knew you liked it."

"Tell me again about that thing."

He snorted. "You need to be a little more specific."

"I don't know if I can be. You know what, what if you just make love to me? I really missed you last night."

He nodded. "I'm sorry about that, baby." He kissed her. "But I will do my best to make it up to you in my bed."

"Delete your voicemail, too. Not right now, but don't listen to it. It's just me ranting about how you're a workaholic and I hate it."

He nodded again, still pulling toward his room. "I'm also a Friskaholic." Another kiss. "Gentle or no?"

She reached up and framed his face with her hands. "Gentle."

He picked her up and carried her the rest of the way to his room where he laid her down reverently. He made sure to forget about anything and everything that wasn't Frisk. She was the most important thing in his life; he couldn't afford to upset her. He felt bad enough that he'd forgotten their date. That had only ever happened one other time and it nearly cost him their relationship. He had to do better.

Every touch was delicious fire to Frisk. She hadn't been lying when she said she missed him. She craved his touch as much as she did his presence. She loved how he worshipped her and took care to give her everything she needed. In return, she gave him what she knew he wanted.

"I love you," he whispered into her ear.

She kissed him and closed her eyes, taking in every sensation. "I love you, too."

"I promise I'll never forget…another date."

"You better not. Mmm…" She held him tighter and kissed him deeper. His magic still tasted like corn dogs and pasta; still his staple foods.

As they laid together, her head on his ribs and his arm around her, he played with her hair and thought about how lucky he was to have her. She had given him everything and rarely asked for much other than his attention in return. She even forgave him when he failed to give her that much.

He kissed her head and held her a little tighter. He truly loved her. He wished there was a way he could show her just how much he loved her. He'd thought about asking her to marry him for a few months, but he wanted to do it right. A regular engagement ring didn't sit right with him. Nothing about their love was regular. She deserved something as unique as they were.

"What are you thinking?" she asked quietly. Her fingers traced a soft pattern on his sternum.

"I want you to marry me." He sucked in a quick breath; he hadn't meant to actually say that.

Frisk could tell he'd let the cat out of the bag by the way his bones stiffened. Still, his proposal was very…Sans. She leaned up on her elbow and kissed him.

"That's good, because I want to marry you."

He frowned a little. "I wanted to propose with something special. I was thinking about how I would do that."

"Well, I'm not going to pretend you didn't ask me."

He smiled and nuzzled her cheek. "Technically, I didn't ask."

"I don't care. There's no going back now. We're engaged." She laid back down on his chest, smiling widely. "I'm so happy right now."

Sans hugged her tightly. "I'm happy that you're happy. You realize I'm going to still propose with something special, right?"

She looked up at him and nodded. "You better. I mean, I need a ring."

He nodded. A ring she would get.

Sans looked around nervously. The restaurant was not very busy, but it was still crowded enough to make this a terrifying prospect.

His entire family was present, including Frisk's parents and Papyrus' boyfriend of several years. Both his dads sat to his left while Frisk sat on his right.

He'd talked to both Gaster and Grillby after accidentally proposing to Frisk. They were happy for him, and Grillby helped him design the perfect engagement ring after Gaster suggested a simple diamond. He didn't understand why it had to be something more than that, but Grillby did. He figured he'd explain it to his husband later.

Once he had the ring, he spoke with Jordan and AnnaLee. They both gave him their blessing, which made him feel better about stealing their only child. AnnaLee told him they considered him and his brother their other children already anyway, so it was just sealing the deal.

Papyrus still had no idea what they were doing here. He thought it was just a nice family dinner. When he'd asked if he could bring along his boyfriend, Sans didn't have the heart to say no.

He hoped Frisk was still oblivious as well. Although they'd already started looking into apartments to get together, they knew they were going to wait until after they were married to move in together. Frisk wanted to keep some kind of small human tradition in their union, and Sans respected that.

He'd been doing better at making sure he remembered their dates. Frisk had taken to texting him the day before they had anything planned to make sure he wasn't drowning in work again. It had saved his ass more than once.

Everyone at the table was quietly talking amongst themselves. He listened in to Frisk's conversation for a moment; she was talking to her mother about a few jobs she'd applied for. He knew she wasn't happy where she was currently working, so he hoped something worked out for her. Then again, maybe once they were married she'd choose to stay at home. Maybe they could adopt a few kids.

He took a deep breath and listened in on his dads' conversation. They were talking about Grillby's next project: he wanted to add a second pool table to his bar and maybe even a foosball table. His bar had been getting busier lately with too many people crowded around the single pool table he currently had.

After another few minutes, he cleared his throat to get everyone's attention. They were all done eating; he needed to do this before he chickened out. Besides, it wasn't like she'd say no.

Once he had the attention of everyone at his table—and a few extras, he realized—he took a breath and stood up.

"I, um…I'd like to thank you guys for coming tonight. It means a lot to me to get family together." He could feel everyone's eyes on him. It made his bones itchy. He fidgeted with his glass for a moment. "But, uh, this is a little more than that." He turned to Frisk and held out his hand. "Will you stand with me?"

Frisk smiled; she had hoped this would be the night he'd officially propose. She took his hand and stood up. She knew he was nervous, but this was bound to be perfect.

"Frisk, there are so many things I want to say to you right now. I wrote down several speeches I might give to tell you how much I love you, but words just don't seem right. I can't tell you how much you mean to me, so I hope this will help."

After another deep breath, he got down on one knee and pulled a box out from his pocket. He held it up and opened it. "Will you marry me?"

"Oh, Sans, of course I will!"

He stood up and pulled the ring out of the box. He was hyper aware of applause all around him as he slipped it onto her finger and kissed her.

She hugged him tightly before holding her hand out to see how the ring glittered in the soft light of the restaurant. It was a thin silver band with an eternity symbol on top. Nestled inside the holes of the symbol on one side was an opal heart. In the other side was a ruby heart.

"The ruby represents you," Sans explained, "and the opal is me. Our souls, entwined together for eternity."

"Did you make it?"

He shook his head. "I didn't make it, but I designed it. Dad helped me; he was the one that suggested the colors. He said you've always been a vibrant red, and my soul is white, so that's how I got those. Are you happy with it?"

She grinned brightly and leaned up to kiss him again. "It's more than perfect. Thank you."

They sat back down. As Frisk showed off her ring to her mother, her father congratulated Sans.

Papyrus all but pulled Frisk out of her seat to hug her. "WOWIE!" he cried, "I can't believe you'll really be my sister. I'm so happy!"

Frisk hugged him back before showing off the ring again.

Papyrus was nearly vibrating as he hugged his brother and congratulated him as well. He went to sit back down, still shaking with excitement. Mettaton put a hand on his bony fists in the middle of the table. He calmed down enough to unfurl his fingers and grip Mettaton's. He grinned at his boyfriend who smiled back.

Sans was a little overwhelmed. It was a good thing he only ever needed to do this once because he wasn't sure he could handle strangers coming up to talk to him about his new engagement. He sure as hell knew he couldn't handle strangers ogling his new fiancée either.

Saying goodbye to people felt like a relief. He could finally go home with Frisk and have a quiet evening with the love of his life. They had decided they'd stay the night at her place since he had a bad habit of leaving work everywhere. As soon as she'd hugged everyone there was to hug—including Mettaton—he was finally able to lead her away to his car.

"Oh, what a fabulous night," she cooed as he opened the passenger side door for her. She stared at her ring the entire ride, grinning like an idiot and occasionally laughing with how giddy she felt.

Sans had a permanent smile as well. He was thrilled that she was so happy. Discovering new things at work wasn't as amazing as seeing her happiness right now.

Once at her house, Sans followed her inside and shut the door behind him. He watched her twirl her way to the closet where she hung up her jacket and took off her shoes. She gave him a sly look and beckoned him closer with her fingers. He obliged.

"I love you, Sans," she said as she reached up to hold onto his tie. "I want to get married as soon as possible. We'll grow old an ornery together."

He put his hands on her hips and pulled her close. "Gentle or no?" he asked.

She bit her lip and looked up at him. "I think I need to ask you that question," she replied.

He raised a brow bone. "What do you mean?"

Without a word, she turned around and led him to her bedroom, still holding onto his tie. Once there, she pushed him back to her bed until he sat down.

"Gentle or no?" she asked. She pushed his shoulders, urging him to lie down.

"Definitely no."

A/N: Thank you so much for reading! I'd love to know your thoughts.

Also, I have two more parts set aside for this story, but they're not fully written yet. Do you guys have any questions, or anything you'd like me to address? I'm not opposed to adding more parts to answer those questions or address those comments/concerns.