Hot! Good job! I like the part where "ours, ours, ours turned into mine, mine, mine" I can see that happening in a three way situation.
I would love to see this go further, like possibly Craig finding out and Stan and Kyle coming to his defense. Or even where they go again but Stan becomes more involved with Tweek causing Kyle to be jealous.
Anywhoo... New favorite smut! you get a cookie!

Ha take that Craig. Tweek is now theirs!

I kinda wanna hear about craig situation now

Great and a very original idea! I just wish Stan doesn't forget about Kyle now that he has a new little pet

I have this hideously large grin on my face right now. Well done, and very hot.

Tweek...with someone other than Craig?

FUCK YES

This is great. Original idea, Kyle, Stan and Tweek. Who ever heard of that? I didn't realize how much I would like it. Nice job!

Kyle, Stan, and...Tweek? Well, I'll certainly give you points for originality. Your POV changed a bit, but otherwise your descriptions were decent. You're off to a good start, and this is a perfectly acceptable oneshot. There definitely aren't enough threesome fics in this fandom.