Good so far!
I've had a good time reading through this so far. I think your biggest strength by far is your character voice. Archie really jumps off the page, both in his internal monologues and his speech, and he feels consistent, so great job with that. It really makes me invest in his character. Also, can't wait to see the chemistry grow even more with Alex! That kiss was great.
Read the story now
I would spend some time refining your style and grammar. The places I noticed this the most was when you would write phonetically, (spelling a word based on how it sounds) and the swear words. I didn't quite have enough time to explain my stance in the comment, so I'll explain here. I would suggest toning it down a little just to make the swear words more effective, or the other thing you could do is have it be something specific to Archie. What I mean by that is having him be the only one to swear to differentiate his character from the others - it makes sense as to why he'd be a bit rough around the edges, but you don't want all the characters to read that way. I take it Alex is the alpha and has that general dominating energy about him, but there's other ways to show that besides swearing. It could be in his demeanour, a look, the way he carries himself. All those good things. He's still a compelling character, but those are my suggestions. Though, my opinion is not the end all be all of writing - I respect any and all decisions you make as an author :)
Okay, I know I read you a little bit there, so I wanted to end on a more positive note. I think you have an interesting plot, with Archie's sister and their whole familial situation giving a great layer of depth to Archie's character. I also can't wait to see what happens with Alex, the chemistry is REAL.
All in all, good job! :)