Papyrus:

You were writing a letter before crumbling it up and throwing it away. Papyrus walked into the kitchen and saw the over flowing trashcan. "Sis... what are you doing?" Papyrus asked, you yelped with a fusion of red and orange on your cheek bones. "NOTHING!" You replied, covering your letter with your arm. "Wait... what is that?" Papyrus asked, seeing the paper under your arm. "Nothing!" You answered, Papyrus glared at you before grabbing it. "Awww!" "Shut up, you shit face!" Papyrus chuckled before you took the paper and crumbled it up. "I just don't know how to tell her." You sighed, Papyrus snickered before he whispered a really dirty idea.

"NO! I SWEAR TO TORIEL!"

"Oh come on. It was a good one."

Sans:

You were nervous for a million reasons. Sans has ordered you to tell Undyne you liked her. You had flowers behind your back as you wore your usual clothes. You took a deep breath before seeing Sans waiting by Papyrus' post. You hesitated before knocking on the iron door. Undyne answered the door, seeing you blushing, eye sockets closed and the flowers in front of you. "I... I love you Undyne... W..Will you be my girlfriend..?" You asked, Undyne took the flowers and smiled. You flinched with your blush increasing when you felt Undyne kissing the top of your head. "I'm free on Tuesday." Undyne informed before leaving, you squealed and jumped around.