Part 1

You don't remember how you ended up on a small patch of surprisingly soft flowers, heck, you barely even remember your name!
You groan and sit up, feeling like your entire body had magically transformed into lead and was trying to drag you back onto the ground. Fantastic way to start you day, hurray.
There's not much to see as you take in your surroundings, probably because it's very dark and all you can visibly see are the moistened rock walls, and looking further upwards, you can just make out a small light. An opening, the one that had you end up here maybe? Possibly.
"Well, well, well. You seem lost!" A high pitched voice suddenly spoke and you jumped before looking around quizzicaly. Who just spoke?
"Down here!" The voice huffed and you gingerly looked downwards...only to see a flower...with a face...and it was talking...how hard did you hit your head?!
"Howdy there, I'm Flowey the Flower, and from now on, your new best friend!" He chirped eagerly,  you could only stare.
"Not much for talking, huh? Well no problem! I'm gonna show you how things work down here in the underground, alright?" You frown at the word 'underground', is that where you were now? And why did it sound so familiar...
"Let's begin with the first action!" Flowey suddenly said and almost immediately you could feel dread pooling in the bottom of your gut t and you were positive that if you had a subconscious self, they would be screaming at you to run as far as the cave-like place you were in allowed.
The flower smiled and pulled out...your heart, well then, you must be dead and entered some messed up form of purgatory for this to be happening. It's just too crazy!
"Collect all these friendliness pellets, they'll help you out, I promise!" He said with a creepy grin, you shuddered but began to do as he said...only for excruciating pain to slam into you all at once. You guessed that those friendliness pellets weren't as friendly as the blasted flower made them out to be because, damn, that hurt, and how are you still alive. Looking up, you froze. The flower had a demonic face now and was screeching with laughter before quieting down and beginning to talk.
"You idiot!  In this world, it's kill or BE killed!" All of a sudden, hundreds of white menacing pellets formed around you and began to close in. Talk about feeling claustrophobic. Flowey cackeld.
You felt that your end was near and the fact that it was caused by a freaking flower made it a million times worse.

...TBC