"You humans and your polluted planet. you guys see nothing like what we see out here in Stardin. Its the most beautiful thing Iv ever seen and best spot in the galaxy to see it. You humans miss out on the true beauty of the sky!" Sans suddenly had such a passionate look in his eyes. 

"I remember... like every night, I would always go and sit out on the roof with my dad Gaster. He would bring out some hot chocolate and we would discuss the universe for hours like the science of astrology is Astronomical" He got up and giggled from the pun "Like how vast it is... and how beautiful the lights and there being so much we dont know because of this forcefield.... but that's what it use to be" He realized he was off about the stars again. He sat down "course.... that's what it was all like... until... Until my father died" Sans looked at his feet "After my father died.... I... well...the sky was no longer beautiful... but it frightened me now because I had no one to hold my hand" He closed his eyes and sighed softly. 

You wave in Gaster as Sans continued talking, "My dads coat, I always felt like if i walked into it far enough I would fall into another galaxy. so id always hold on tight to his hand or his waist when I hugged him so I wouldn't fall. Course iv... kinda gotten over the fear but yet still I cant help but feel lost and alone, My father was like the smartest man alive... he would always teach me something new...." He smiled weakly. "ya know?"He looked at you and noticed you where looking behind yourself. 

He turned his head and suddenly his eyes widdened and tears filled his eyes. "f-father?!" He cried unable to contain his excitement and lunged and his dad caught him "I tohught you where dead" He cried quietly. "Not dead, just stuck my boy" He smiled softly. "Daddy~" He whimpered like a baby. "Sansy... its ok" He smiled, "Daddy" He repeats as he sobbed into his fathers shoulder. you couldn't help but shed a tear yourself it was too cute, and then you couldn't contain your sobbing when Gaster says 

"Sansy... my little boy" He smiled.