Requested by NewLanguages

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"You're dismissed."Nightmare says as the room quickly empties into the halls.

He grins, his tentacles starting to wag as he reads the latest reports. Then a single tentacle slithers out of the room, snatching Cross and pulling him into the room. 

"Hey, I thought we were just assigned missions. Don't you want me to get on that?"His boyfriend asks after being released

"I changed my mind. Have you seen the ring lately?"He replies

He could sense the panic spike in Cross as he looked at him in shock, hesitating to answer. He could feel the fear in his boyfriend's racing soul.

"Ring? What ring? I don't know about any rings. Well I know what rings are but-"Cross begins

"The ring that the destroyer gave his new fiance, Death. They seem like a good pair to get engaged to each other. Quite fitting, Destruction and Death going together."He says, revealing the reports showing Error proposing to Reaper in OuterTale.

The new pair of fiances were indeed very happy in the pictures.

"Oh...That's what you meant."Cross says

"What did you think I meant?"He asks

"Oh! I wasn't sure if you were changing my mission to focus on some mob or other criminal rings in AUs that could provide you negativity."Cross says

"Love the creativity, Cross. But you do realize that I can tell when you lie, right? So, what's the truth?"He asks

He smirks as he sees his boyfriend's face turn a bright purple, easily catching on to the real reason.

"Oooh! I think I know where your mind went...How cute.~"He says teasingly, going around his desk to approach Cross.

"I don't know what you're talking about."Cross says

"No need to be so nervous.~"He says as his tentacles wiggle

"I'm not nervous! I'm perfectly calm!"Cross says

He grins, taking Cross's hand with a grin, trying to tease him more. The funny thing is that Nightmare's hand is smaller than his boyfriend's and he knows that Cross finds it cute. Within seconds, he sees steam coming off of his burning purple skull.

"Perfectly calm, huh?~"

"That's not fair! You know how I react to this!"Cross says

"You really thought that I'd drag you in here after a meeting to propose? Come on, Crossy, give me some credit. If I were to propose, it would definitely be a lot more grand than this."He says with a grin

"I-If you proposed?"Cross stutters, his eyes shrinking in shock.

"Yes, you are very special to me. So, I would make such a meaningful moment a lot more special than just pulling you into my office. There's a difference between business and life."

He grins, then leans closer. 

"Don't let the goop fool you, Cross. I can clean up really nicely in a suit.~"He whispers quietly

He grins widely, seeing his words sink in. The image enters Cross's head and his soul nearly leaves his chest. Then he turns away, hiding his face.

"STOP! You're not funny!"

"Oh come on, Crossy. Haven't you thought of it before? Clearly, you have if you thought that's what I meant. How does the song go?"He says, then takes out his phone

Cross shuts his eyes, glancing away as his soul beats out of his chest. Then he hears "Here Comes the Bride" start playing from Nightmare's phone. His skull isn't white anymore, it's just a grape hiding all his features.

"Here comes the groom, here comes the groom!~"Nightmare sings along to the tune.

Then he breaks into laughter as his tentacles form hearts.

"I'm glad that you found this as just another hilarious opportunity to tease me."Cross huffs

"Oh come on, Crossy. You know I love you.~"He says

He sighs as Nightmare places a gentle kiss on his cheek, nodding.

"So? Have you thought about anything aside from the rings? Like what comes after marriage perhaps?~ I think you'd like very handsome and I have a few ideas about afterward.~"Nightmare coos to him

Cross feels his gaze on him and tries to hide his face, tucking his head under Nightmare's chin. Nightmare kisses him on the head.

"As if that would really happen in this chaos. You're adorable, Cross.~"He coos

Then there's a knock at the door, making them glance over.

"What's your business?"Nightmare asks

"Can I speak with Cross for a moment?"Horror asks

Nightmare nods, releasing Cross. He steps away to open the door. Horror smiles at him, his big red eye twinkling.

"I did the favor that you asked me about. Nobody will find it without my help now and I'll only take it out when you think it's right."Horror says

"Thanks, Horror."Cross says

"Anything for you, bud. Maybe after our missions, we could go searching to help you prepare? Farm says he could show you his orchard and I'm sure there are plenty of shops to explore for the big day?"Horror suggests

"You're really up for that?"He asks

"It's important to you, so it's important to me. Besides, Killer would just ruin it by causing trouble and Dust would complain the entire time. And it'd be fun. Plus I'm already the cook for Error's big day so I don't mind helping you prepare for yours."Horror says

"Thank you, Horror. I think that'd be great."He says

"Alright, I'll message you then."Horror says, walking away.

Cross shuts the door, smiling brightly now. He turns to Nightmare, who freezes up. As much as he hates positivity, he finds it cute when Cross smiles. When Cross does anything really, but especially when he smiles, laughs, or gets flustered by being teased. Cross grins, walking over to pet his tentacles. 

But now it's clicking in Nightmare's head. Cross didn't think that he was going to propose. It's the other way around, and Cross feared that he was caught. Now the image of Cross in a suit doing so or on their wedding day enters his mind and he becomes a blushing mess as his tentacles hang low and wag wildly at the idea.

"Cross...."

"Yes, Night?"Cross says

"What did rings mean to you? What was that about?"

"Oh, nothing...for now."Cross says with a grin

"What do you mean for now?"

"You'll see...one day."He says, knowing Nightmare hates suspense or the unknown.

It only allows Nightmare's mind to run wild with ideas. His face burns even more and Cross grins, kissing his cheek.

"You're so cute, Night. You and your wonderful mind are so entertaining. Now, you gave me a mission so I'll go do it. We can talk later. Love you!~"He says, walking out the door.

The door shuts and Nightmare leans against his desk, holding his chest as his soul beats out of his chest. His tentacles hang limp on the floor, bubbling with hearts. On the other side is Cross hiding his face in the hallway, muffling a squeal as he couldn't believe that he just did that. Within seconds his face is as purple as a grape as Nightmare's teasing comments repeat in his head. He quickly runs off for his mission before he loses focus.

Both left excited for that special moment.

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And there it is! The prompt was NM teasing "the hell out of" Cross so I hope this is enough. But I couldn't resist having the twist where NM also gets teased or flustered. It's cute, and I hope you enjoy it. :D