Caged (Nightmare X OC)

Dying

Nightmare found his emotions shifting towards Sidney against his will. It was a constant turmoil within him. The corruption vs his soul. No, he couldn't quite call it love, for that would truly be the end of him, but it was something of an... affection? He found himself enjoying her company and opening up a bit more after that 'bonding moment'. Even now, the two were playing chess in their favorite place. His library. "check."
"Tell me about the boys, Night. How'd the Bad Sanses come to be?" Sidney asked as she decisively made her move. "Check."
"they were no more than pawns to my game. error and i had a mutual agreement that if i helped him destroy, i could tag along to feed of the negativity. dust, killer, and horror served double purposes of creating more negativity as i also fed off their negativity. check."
"And now? Do you plan on breaking them out of their confinement? Check."
"that was the plan. i've located error in the ruins of alphatale and dust is in asylumtale. horror is in sciencetale. killer will be the most difficult to retrieve, being in undertale. check."
"That's the original right? Check."
"correct. checkmate."
"Again!?"

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Its been a month since that chess game.. Something was up with Nightmare. It wasn't just his newfound kindness towards Sidney. He seemed more distracted, more tired. He was always 'melting' in a way, and she usually cleaned it up, but he seemed to be melting more than usual. He was losing a lot of goop. It was worrying. As his wife, she was worried. Was she not giving him enough negativity? She made him waffles for breakfast.  He loved her waffles. But now, he wasn't touching them. He was leaning back tiredly in his chair. His extra appendages were no more than a melting puddle on the floor. "Nightmare, do you need more negativity, you look... terrible." He chuckled quietly. "thanks... but no. it's not that.."
"Then what is it? I want to help. Please, Night."
"you can't help me with this, sid." She blushed at the nickname, but focused on him. "I can at least try!" He chuckled again. "always so selfless.. very well. i'm dying."
"D- why?! What happened?!"
"i... seem to have fallen for you, despite my best efforts not too.. emotions like love... do not mix well with negativity. so i'm dying."

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That had come to a shock to Sidney. It shouldn't have, it was exactly how she'd gotten rid of her corruption, but still. Nightmare was dying because of her. It made her feel guilty. She'd been selfish, not selfless. She got what she wanted, but now her husband was dying. He was bedridden, her idea to try and conserve whatever magic and negativity he had left. She even focused on more negative emotions to help him. But he seemed to be melting faster every day. How much goop was the guy made of, anyway? "I'm sorry for doing this to you, Nightmare.." She could honestly say she'd fallen for him too. She didn't know when. She didn't really care when either. But now that their marriage wasn't loveless, he was dying. That's what hurt the most. They finally got there, only to find out that love was lethal to the embodiment of Negativity. "Hey night.. I brought lunch... chicken wrap. I hope you like it."
"heh heh... you made it, i'm sure it will be amazing.." Sidney smiled sadly. "Thanks.."
"sidney." She gave him her full attention. "Yeah?"
"i'm sorry.. i'm sorry i am an ass. i'm sorry for the pain and suffering i've caused you... and forgive me for being so blind... to all the suffering i've caused.."
"Just eat... you have no reason to apologize to me, I forgave you long ago.."