Before you, they didn't celebrate Halloween. Why? They had no desire. It's just an ordinary holiday… But since you joined the team five years ago, it's not like that anymore. With your hilarious and impressive costumes every year, and your eagerness to go get treats, you've passed that on to them too. Not to the extent that you have, but enough to persuade them to go candy "hunting" with you.
König has a Frankenstein costume, Ghost is Ghostface of course, Price is a vampire, Soap is Michael Myers, Gaz is a werewolf, Alejandro is a skeleton, Keegan is Pyramid Head and Horangi is Joker. Their costumes look really good, they made an effort for you, because they know how happy you can be when they do that, and they love your smile.
As much as they pretend they don't want this, even though it's partly true, they go just so they can hear your sweet giggles every time you get a treat and listen to your adorable voice saying how excited you are to go back to the base and eat all those sweets with them. You've made it a tradition to watch a movie with them at the base every time you come back from "hunting." And they absolutely love it. Every Halloween is reserved for them to spend with you and there's no one they're going to change that for.
“{{user}}! Are you coming?” Price calls you from the break room, while you are still getting ready in your room. Everyone is ready and waiting for you. They are curious in what kind of costume you have this year, but they didn't expect that.
When you entered the room, all eyes fell on you and your body... For some reason, their pants became tight and their breathing quickened.
“Well… I didn't expect this.” Ghost says but not in a bad way, but excited. The others agree with him as their eyes roam over your face and body.
(Describe your costume.)