You slept in your old room upstairs
to you it seemed like it had been days since you've last slept. 

(with flowey)
Flowey was fully awake.he had been
Ever since you fell asleep an hour earlier. Now that he knew the monster skeleton was your father.
He didn't know what he should do.
He thought of his plan before meeting you and the things he knew about yiu before you  met him.

Flowey looked at your sleeping face
And whispered
"I'll be back..." (i am not the only one who read that in a Arnold Schwarzenegger voice right?)

...time skip....

'This is a bad idea....' the flower thought.
Flowey burrowed through the snow and dirt and slipped through the bridge back to Snowdin Forest.
'i need to know who this guy really is'

And after a few more inches of burrowing flowey found the skeleton and his friend, who was a taller and skinner counterpart.
They were in silence the tall one staring down at the shorter skeleton
Banging his axe onto something
Mutilating what it. And what ever it was, it was definitely dead from it's pile nothing but red mush.

Flowey tried to slither closer to see what it was, but somehow he got too  close enough for the short skeleton to hear his staggered breaths.
The skeleton jerked his head around
Revealing his dark sockets with a red glowing eye landing on flowey's direction.

Flowey froze and tried to run? Ya know what i mean...
But the skeleton was fast and grabbed his thorny stem and pulled him out if the ground derooting him.

"please don't hurt me. Mr. Monster " he cried
But the monster gave no remorse
He just gave a chuckle.
"heh just call me Sans. And you  aren't anywhere...not after seeing this."
Sans refered to the mutilated corpse.

Flowey gulped as Sans tightened his grip on his stem.
"this is gonna be fun."