(So starting off, this is Obsessions by Marina And The Diamonds. Next off, if there are any songs you would like to hear in a song fic, please comment them. I need more ideas daily. Thank you in advance. Hope you enjoy this one. This one may be a bit confusing so sorry about that. There were a bunch of people who asked for a Bismuth X Reader so you know who you are!)

Your p.o.v
Sunday, wake up, give me a cigarette.
Last night's love affair is looking vulnerable in my bed
Silk sheet, blue dawn, Colgate, tongue warm
Won't you quit your crying? I can't sleep
One minute I'm a little sweetheart
And next minute you are an absolute creep

This was a mistake. All of it. Sitting up in bed, I look down at Bismuth, my latest "lover". Pulling my shirt over my head, I walked to the kitchen. "(Y/n)?" Before I could leave my room, Bismuth woke up. "Where are you going? Are you really leaving?" She said, wining. "No I'm not leaving....just need some-" She cut me off. "Oh let me come with you!" I growled. "Leave me alone! Oh my god! I just slept with you, isn't that enough?!" Bismuth looked at me, shocked that I was so nice a minute ago. I walked out before she could say anything else. I knew this was a bad idea. She was just suppose to be that "Friday drunken one night stand". Yeah....that was a month ago.... ever since then, she's just been...crazy! Obsessed! I can never get a break! It's always "Oh, let's do this!" and "Come with me!" Honestly, she needs a break....

We've got obsessions
I want to wipe out all the sad ideas that come to me when I am holding you
We've got obsessions
All you ever think about are sick ideas involving me, involving you

I think the worst part, is easily every time I do sleep with her, which is probably three times a week, is that I am always, ALWAYS, informed of the bad thoughts of Bismuth. Y'know, about the Gem War and being poofed by the very gem she looked up to. That stuff. It's like....every time I'm around, she thinks of these terrible things that happened to her, like some sort of thing that would make me pity her! Like she does this for attention! What kind of sick freak does that?! And she always tells me that she loves me. Like, honestly. It's....kinda weird. I grab a whole wine bottle, downing half of if on the spot. "You're obsessed with me. And it's so so weird." I laugh to myself. "Obsessed?" Bismuth walked up behind me. "I'm not obsessed. I only love you. A lot actually!" Slamming the wine bottle on the floor, I snap. "Shut up! You've known me for a month. You can't love me! You're just....ugh!" I storm out of the house. I'll just stay at a friends house or something.

Supermarket, oh what packet of crackers to pick?
They're all the same, one brand, one name, but really they're not
Look, look, just choose something quick
People are staring, time to go quick in
Skin is on fire
Just choose something, something, something

The next day, I wanted to get some food. I was forced to stay at a friends house. That was, until about four in the morning when I went home. Thank god Bismuth was gone at that time. "Okay so....crackers...I guess...." I stare at the food, eventually getting lost in thought. "Was I too harsh....no, not really. She did have it coming. She can't just follow me everywhere....but then again, she has been trapped for a while. Ugh this is too confusing." I mumble to myself. With a sigh, I finally get a box and walk away, slowly. While walking down the cracker aisle, I began to hear whispers, and I could feel eyes burning into the back of my skull.
"Yes, that's them...you know, the one with Bismuth."
"That's pretty weird."
"Why did Bismuth go for....them?"
"It went from a one night stand, to a relationship. Strange. I didn't see this coming at all."

Pressure overwhelming
Next minute I am turning out of the door, facing one week without food
A day, a day when things, things are pretty bad
Don't let it make you feel sad, the crackers were probably bad luck anyway
Can't let your cold heart be free
When you act like you've got an OCD

"Shut up!" I turn around and yell at those who where talking about me. Regretting it greatly, I drop everything I had and ran. As fast as I could, cheeks burning out of embarrassment. Note to self,  never go there again. "Dammit! Now....now I don't have anything to eat." Grumbling to myself, I march home. "Stupid Bismuth....stupid emotions....stupid people talking shit about me....stupid crackers!" I yell out, furious at literally everything. Once I got home, I broke the door down. "I'll fix it later I guess." In the kitchen was the mess if wine from last night. Along with a note.

Dear (Y/n),
I'm sorry. I'm sorry for last night, and the past month. I guess I am pretty obsessed. You're just the first person to ever show affection towards me. Don't come running after me. Please, I need to forget you. It will be much better this way. Besides, as the humans say "if you love something, let it go." And I really do love you.

Good luck,
Bismuth

I rip up the note on the spot. "You idiot! Out of all the times, you leave now! I need you! I need to forget all of this....I need you to forget that stuff...." I fell onto the floor, in a mess of day old wine, broken glass and tears. "Please...." I didn't know what to think at this point. One moment I hate her, another I love her. Without thinking, I grab my phone and call her. Yes, she was a gem, but she was decently advanced. "Get over here! Now!" I yelled. Throwing my phone across the room before she could answer.

We've got obsessions
I wanna erase every nasty thought that bugs me every day of every week
We've got obsessions
You never told me what it was that made you strong and what it was that made you weak

In a matter of what I thought was hours and hours, Bismuth finally arrived. She rushed over to me, wondering what the actual fuck was wrong. 'I can't continue doing this, I can't keep on running back to her....' I thought. Pushing those bad ideas to the back of my brain, I roughly locked my lips with hers. It felt as if it was the first time we actually kissed, when I truly liked her, unlike now. I don't love her, I'm obsessed with the idea of her. I'm using Bismuth. I'm using her so I don't feel alone, afraid, unloved. This is me, tricking myself into loving someone I don't for the hell of it. None of this is genuine. 'What the fuck is wrong with me?' I pull away. Bismuth looked at me, eyes half lidded, a look of lust in her eyes. "I love you, (Y/n)." She said, voice cracking. "I know."

We've got obsessions
I wanna erase every nasty thought that bugs me every day of every week.
We've got obsessions
You never told me what it was that made you strong and what it was that made you weak

Bismuth toppled over me, I had almost zero self control. I had blacked out, this wasn't me. But yet, It was. She left small kisses on my neck, this is what I want. Right? No! Yes! 'Suck it up. Do you really want to be miserable without her? You know once she leaves, you will be a mess. Love her for this moment, hate her later.' I yelled in my mind. "You know, for a human, you really make me soft. I'd do anything for you." Bismuth's voice was muffled in my neck. "I know that. Just hurry up, if you're going to do anything, do it now." I replied flatly. Bismuth gripped my hips, smiling evilly, but her eyes held sorrow. She knew I didn't truly love her. She knew I was doing this so I could drown my sorrows in her pleasure for the time being. She knew everything. Bismuth isn't the one with the obsession, I am.

We've got obsessions (Made you weak)

It was all a blur. A big, regrettable, blur. Bismuth wrapped her arms around me to cuddle, something she always did after we fucked. This love affair had to stop. But I can't stop it. As long as she loves me, she'll be here for me. No matter what it is. And that's how it will be until I die. I could cheat, lie, and beat her. She won't leave. Then again, she can cheat, lie, and beat me, and I myself, will crawl back to her. Why?.....I'm not sure. But one day, this obsession will come to an end. Wiggling out of Bismuth's grasp, I look down. Lighting a cigarette, I take a puff, and throw it on the floor, causing the carpet, then the curtains, then everything else to set fire. This is where it ends. This is how it ends. There is no turning back now, no matter how hard I try to get her back, I won't.

Sunday, wake up, give me a cigarette
Last night's love affair is looking vulnerable again