I read 'Claimed by My Brother's Best Friends' months ago, and yeah, the ending is a total spoiler minefield. Online plot summaries and fan theories are everywhere, especially on forums dedicated to dark romance or why-choose tropes. If you're in the middle of the story, I'd be really careful just typing the names into a search bar. The last few chapters hinge on a major confrontation between the heroine, Alyssa, and the dynamic with the guys, particularly King. You'll definitely have the HEA outcome ruined if you're not careful.
I stumbled across a TikTok that casually mentioned who she ends up with permanently, and it really deflated the tension for me. The book builds this whole 'will they or won't they' vibe around the shared claim, and knowing the resolution beforehand stripped a lot of the urgency from the later conflicts. My advice is to mute any related hashtags on social media and avoid Goodreads reviews until you're done. The community is great, but people aren't shy about discussing final pairings in the comments.
The final scene involves a specific, symbolic gesture from one of the men that's a huge payoff if it's a surprise.