Thank you, @eyeofthetiger501, for requesting this piece! I'm sorry it took over a month to get to it, but I never forgot!
Summary: You are so tiny it's not funny. Nor is being captured and closed inside a glass jar.
Warnings: Yandere, Possessive, Claustrophobia
A/N: Gender Neutral Reader, Borrower Reader, Sanemi Shinazugawa
You were a Borrower, a small humanoid being about the size of a grown man's finger, living in houses inhabited by humans, all while staying hidden from them. As your name suggested, you would borrow or take things, little things that humans wouldn't miss or even notice disappearing.
You know, normal stuff like one strawberry, one cube of sugar or such… But you had gotten greedy and got yourself caught by a human male.
He was a scary one, called Sanemi Shniazugawa and he was one of the strongest humans there were because he was a Hashira who specialized in killing these horrible beings that plagued the lands of Japan, called Demons.
"So you're the one who I've heard skittering around here?" He had asked, fully ready to take you and throw you away like you were a bug… But when he saw you looking at him with those big shiny tear-filled eyes, he felt his heart tighten and fluffy feelings rise inside him.
That's when instead of tossing you away, he decided to keep you.
And so you found yourself living in a glass terrarium like a pet of some sort. Normally you would be able to climb most surfaces, but slippery glass proved to be too much for you.
That didn't mean that you didn't manage to leave your terrarium once in a while. You were a creative little person who always found a new way to try and escape.
However, that didn't mean you actually succeeded. Nope, somehow, you weren't sure how he always returned home when you would attempt an escape… And each time, he caught you.
"Why do you always try to escape!?" Sanemi snapped as his fingers clenched around you, and it was clear he was holding himself back from squeezing as hard as he wanted to because if he had done so, you would have certainly died.
"Are you not happy!? Is that it!?" The huge man scowled, "Am I not making sure you have everything your little heart could ever desire!?"
He was more than generous, always making sure you had something delicious to eat or quench your thirst with, clothes made from such pretty fabrics and toys of different kinds…
"Ungrateful little shits like you end up in the jar!" He snapped as he turned to walk towards the closet where he kept his futon when he wasn't sleeping. But it wasn't the soft mattress that you feared, but the dark closet and the small jar with holes poked into it inside there.
"N- No!" You cried out loud in fear, "Not the jar!"
When Sanemi had first caught you he had put you temporarily inside the glass jar while he tried to figure out where to keep you, but you had started crying and hyperventilating in there. You felt so claustrophobic in there, like you were running out of air and when the darkness was added to your punishment, your worst fear came to life.
"Then beg." He ordered as he looked down at you, "Earn my forgiveness."
"I'm so sorry, I'm so stupid, I don't know any better!" You started to cry furiously, so fearful of the punishment looming just a couple of steps away, "You're always so generous, but I'm just so ungrateful!"
"That you really are," He nodded, yet he still took those couple steps and slid the closet door aside, "But I have some business to take care of and I can't risk you trying to escape again while I'm not here…!"
"N- No, please!" You cried as he turned the lid off and dropped you into the jar. You fell on your ass, but you quickly jumped up as the lid was put back in its place and you started to bang the glass with your small fists.
"Please! Don't leave me here!"
"Maybe this will finally teach you some gratefulness…!" He grunted as he slammed the door shut, leaving you alone in darkness, hugging your knees and crying.
You don't know how much time passed, it felt like an eternity in there as you regretted your every life decision that led to that very moment of you being locked up… But finally, the door slid open and Sanemi's scarred face came into your view.
"You're there," He nodded, "Good."
"Wh- Where were you!?" You cried out as he picked up the jar, opened it, and tilted it so you could safely crawl out of there and straight into his waiting palm, "I- I was so scared…!"
"I was out for an hour," He simply stated, but you were crying out loud so you probably couldn't hear him properly or you were just too thankful to pay attention to anything other than air and light.
As soon as you popped onto his palm, you wrapped your tiny arms around his thumb and held onto him like your life depended on it.
"How was the jar?" Sanemi dared to ask, making you whimper as you hugged his thumb harder, "Scary…! Never, please, don't ever put me back there…!"
"That's completely up to you," The man glared down at you, "Are you going to try and escape again?"
"No, no, I won't!" You sobbed so hard you were getting hiccups, "I'm sorry, I swear, I won't do it again!"
"Good," He nodded, not quite smiling but you could tell he wasn't as mad as he was before by the way he gently petted the top of your head with the tip of his finger.
"Now let's eat. I got some Ohagi while I was gone, I bet you are going to love it," He muttered as he carried you out of the bedroom, and you tried your hardest to stop crying again
Yes, you had every comfort that one would desire… All except freedom that you so badly wanted, no, desired…