Idea came from something that happened at school and RP

You sat in the anti-void alone. Error had left you. Normally he would watch you and make sure you won't escape. The attention was nice compared to what you got in Underfell.

A portal opened. You looked up to see Error. He stumbled over to you "hey cutie~" he slurred
"Error are you drunk?" You shifted back. Error laughed "pfft what no" he used his wires to pull you closer "you want to know something
Y/N~" he purred "I love you a lot" he pushed his teeth against your lips. You quickly shoved him away "Error I'd believe that if you were sober"

"Aww come on cutie" he pouted. You pushed him away again "Error no!" He moved back to you pushing you to the ground "Error yes" he pressed his teeth against your neck "your beautiful" he whispered. You pushed him off you "Error please stop"

Error used his wires again to pull you closer "come on Y/N don't you want to have done fun~" your face heated up "well someone has a dirty mind" you shoved him away again "I've already got one skeleton inside me I don't need another"

Error looked down at you. You had to admit you were starting to get feelings towards him. You pushed Error off you. He laughed and lay on the ground before pulling closer to him.

You lay on top of Error blushing. He shifted his position so he was lying on his side. You liked Error and this may be the only chance you get to be close with him. He pressed his teeth against your lips again. This time you kissed back. Error chuckled. "I love you Y/N" You soon both fell asleep.

Error woke up first. He didn't fell that well. He saw you asleep next to him. You didn't look harmed in away way. That was a good sign.

Error sat up holding you. He made your soul appare. It was a normal heart shaped one. Yours was F/C and sparkled slightly. You opened your eyes and looked up at Error. He hadn't noticed you were awake. Error hugged you tighter with one arm. In his other hand your soul floated.

"What are you doing?" You asked ending it with a yawn. A yellow blush ran along Error's cheekbones "Y-your awake" he suddenly "whatever I said I didn't mean!" He sounded worried and embrased. "Oh" was all you said. Error could tell be the tone of your voice that you were upset "all the good things I said I ment them"

You looked up at Error blushing. He pressed his teeth against your lips before pulling away and saying
"Y/N L/N from the moment I saw you I liked you. The more I got to know you the more I fell for you.
Y/N I love you" you smiled at Error "I love you too"