Sans fell asleep in Papyrus arms, Papyrus's heart broke when he was watching his little brother crying to sleep.
Papyrus tucked Sans in his bed.
Papyrus left the room quietly, he was startled by his friends standing there shocked.
"Was Sans telling the truth?" Toriel asked fearfully.
"J-judging by the way he was acting I think so" Alphys said.
"I never saw the punk so broken like this." Undyne said quietly.
"I got some serious talk with this two." Toriel said seriously while going going downstairs.
At midnight, Undyne woke up to some noise, she heard someone going downstairs.
She got up from the bed and went outside she saw Sans watching his reflection on the pond.
"Hey punk." Sans got startled by Undyne's voice.
"Undyne don't scare me like that." Sans said his voice was hoarse from all of this crying.
"Uh, are you better now?" Undyne asked.
"A tiny bit" Sans said sadly.
"Undyne?" Sans asked to catch Undyne's attention.
"How would feel if Alphys cheated on you?" Sans asked quietly.
Undyne wasn't sure how to answer that question.
Sans noticed her awkwardness.
"Y-you don't have to answer" Sans said.
They stayed silent for a while until Undyne heard Sans mumbling something.
"What did you say?" Undyne asked curiously.
"I'm a terrible boyfriend." Sans whispered.
Undyne was shocked from his low self-esteem.
"Don't say anything Undyne if I was a better boyfriend, she wouldn't have fallen for Asriel." Sans said as tears began to fill his eyes.
"No." Undyne interrupted.
"What?" Sans asked.
"No Sans you're not a terrible boyfriend, you did so many things to Frisk that no man has done to his woman, you loved her more than anyone else did even more than Toriel and Asgore did, you understood love more than any of us not just romantic love every kind of love, Frisk can't see what she has, so don't give up on love you'll soon find someone who loves you and faithful to you."
Sans was speechless at this, he didn't know what to say, he didn't know how to feel anymore.
Undyne patted Sans on his head and left.
Sans was flattered by this words he felt warm in his heart.