After you and Sans and the other monsters got out of the underground they had to learn how to live in the real world. After awhile everything was going fine and you and Sans and the others seemed to be doing well.
Tho Sans after really hanging out with you a lot more he started notice how much he actually liked you and loved you deeply but he would never admit that and he would act like his nonchalant self and you didn’t suspect anything different from him.
To you he was just your silly ol’skelly  bones but deep down Sans knew he loved you and he really wanted to show you his love and be with you. He really enjoyed looking at the stars so he thought that this would be a good plan and date for you and him even tho he wasn’t going to tell you it was a date.
He called you earlier and told you to meet him at y’all’s favorite spot outside. When you got there he was sitting on a blanket and looking at the stars he looked away towards you and spoke while patting the blanket “Heya kiddo, wanna come and join me?” He spoke softly trying to remain calm and normal as always.