A/N: So, CarbohydrateCaretaker (on Ao3) gifted a story to me based on what we were talking about. Decided to reciprocate the gesture with the same premise, but it's my own version of the idea, ha ha.

Overdose

Dexter held up the small bottle of M-99, or etorphine hydrochloride, and admired it.

'Ah, the first time I ever got M-99. It was one of the rare moments I felt gleeful in my life. Especially since I had the perfect candidate lined up to use it on.'

He checked to make sure he was alone in the house before taking out the stockpile of syringes he had also acquired recently and the small container of saline he had hidden in one of his drawers.

'I hadn't yet told Harry that I had gotten the powerful tranquilizer, not knowing how he would react.'

Dexter filled up one of the syringes with saline before sucking up a small amount of the M-99 to mix the solution together.

'M-99 was deadly to humans, so I knew it needed to be diluted to simply knock them out. But I was still new at it, so I didn't know the correct amount I needed at the time.'

"Anthony Acosta, you get to be my trial run," he said with a smirk as he flicked the syringe to get the bubbles out.

'I would learn, however.'

Dexter tapped on the steering wheel of his truck as he waited outside the bar for Anthony. Watching him for the past week, he knew the guy liked to drink every other night up until one in the morning. Deciding to pass the time, he grabbed the guy's file and looked through it once more.

"Anthony Acosta, was wanted for the murder of three women, got caught, but was let off due to faulty filed paperwork. One justice system's fuck up is a serial killer's treasure," he said as he tapped the photo of Anthony with a huffed laugh.

His chosen victim was a big guy, standing roughly at six feet and three inches and was a wall of muscle, hence part of the reason he decided to get a tranquilizer. It was a pain, even with his fake identity, but once he was set up, it would not be an issue as he could order it anytime he needed more.

Setting aside the folder, Dexter checked the time and noticed it was almost one.

"Perfect," he mumbled and turned to pay attention to the front door of the bar. At around five after, Anthony stumbled out and made his way into the dark alley next to the building. Dexter knew he liked to go in there to take a piss, for whatever reason, so he knew it was the perfect time to strike. Putting the syringe between his teeth, he exited his truck as swiftly and quietly as possible, and followed his victim into the alley.

It did not take Dexter too long to find out the guy was guilty of the murders he was accused of. The women he killed were all blungeoned to death, so it was easy to locate his murder weapon, which happened to be a crowbar, and test the blood on it. The idiot had left the thing in plain sight in his garage.

Sneaking up behind Anthony, who was too drunk and busy with his bodily business to notice him, Dexter reached up and jabbed the needle into the side of his victim's neck and quickly injected him with the M-99.

"Hey! What the fu-" He started to say before the tranquilizer hit his system and he was out like a light. He toppled over and landed in his own piss, making Dexter grimace in disgust.

"I should have waited until he was done," Dexter grumbled, but was glad the stuff worked like a charm regardless. He grabbed ahold of Anthony's feet and started dragging him. He stopped at the entrance to the alley and looked around to make sure no one was nearby that could see him. He had an explanation ready if he was spotted, but thankfully the streets were empty of any people.

He swiftly loaded him up into the back of his truck as quickly as he could, and covered him with a tarp. He was not about to put a drunken guy covered in piss inside his truck, after all. Still, he would have to wash out the bed of his truck. Not only to get rid of evidence, but to clean it of piss and dirt.

Dexter got into the driver's seat and started up his truck, and started to casually drive off towards his chosen kill room- an abandoned bar on the bad side of town. Even if anyone heard anything, no one in the neighborhood would even question it. It was perfect.

'I didn't know it right then, but my night of fun had been completely ruined by my own inexperience.'

Pulling up to the bar, Dexter looked around to make sure he was alone, which he was, before he exited the vehicle. He went around the back to the bed and lowered the tailgate, removed the tarp, grabbed Anthony by his feet, and proceeded to drag him into the empty bar that he had set up earlier in the day.

Once inside, he dragged his victim over to the table and, with a bit of huffing and grunting with effort, managed to get the guy on top of it. Catching his breath, Dexter cut off his clothes then wrapped Anthony up in several layers of saran wrap and duct tape to ensure the brute of a man did not escape.

Now came the waiting.

Dexter changed into his kill outfit and sat down at one of the bar stools, one he had cleaned off, obviously, and waited

And waited. And waited.

He frowned as he looked at his watch, noticing it had been almost half an hour and Anthony had not woken up.

That was worrying. The amount of M-99 he had given him should have only kept him out for an hour. With the drive it took to get to the abandoned bar, it was well over an hour now. With an annoyed huff, Dexter got up and walked over to his victim and slapped him on the face.

No response. Great. Dexter put two fingers up to Anthony's neck to check for a pulse and cursed out loud when he did not feel a pulse under his fingers.

He had given him too much M-99 and killed him. He was probably dead before Dexter even loaded him up into the bed of his truck.

"Fuck! Goddamn it!" Dexter yelled and kicked over a bar stool in his anger. His entire night was now ruined! His playmate was dead before he even got a chance to 'play' with him!

He grabbed an old, empty bottle of beer and threw it at the wall, satisfied when it broke into multiple pieces. He grabbed another and did the same thing, repeating the action until all of the bottles that were nearby on the bar were now on the ground shattered.

Dexter leaned on the bar and breathed heavily, trying to calm himself down. With one last gulp of air, he turned to the corpse of Anthony and glared. "You just had to fucking die, didn't you?"

With a huff at the lack of an answer, he grabbed his knife and angrily cut away the tape and saran wrap before carelessly pushing the body to the ground off of the table. He grabbed the now dead Anthony by his ankles and, once more, dragged him out to his truck. He loaded him up, not caring at this point if anyone saw him, something he knew his dad would not approve of, and peeled out of the area to head to his rented boat.

'With Alligator Alley out of the question, I had to find a new way to dump bodies, and it was one I would stick with for most of my life.'

Once out in the middle of the bay, Dexter threw Anthony's body overboard and watched as his body sank to the bottom to become fish food. He sat back in his boat and tilted his head back to look up at the sky with a frown.

"Definitely need to adjust the dose. No more overdoses."

'It took a few tries, but eventually, I found the perfect combination of M-99 and saline. I rarely ever had to adjust it, except for a few occasions. But I never overdosed anyone on M-99 after Anthony Acosta ever again.'

END

A/N: Well, there you have it, hope you enjoyed it!