is kaoru really in Любовь with his brother hikaru?

No, They're just playing around like...flirting?
I don't know but they're not in Любовь with each other its еще like Актёрское искусство in the host club, so like if Ты see them not around girls then they would act pretty normal

It's really just an act LOL to impress Яой fangirls

In Kaoru-kun and Hikaru-kun's case I feel that they're just Актёрское искусство and it's just for the customers/girls I know they like eachother as brothers but not in that fashion..well I don't think so anyway.

No he is in Любовь with haruhi, in the Манга kaoru figured it out before tamaki and hikaru and he told haruhi he loved her but wanted to give h her to hikaru because he loved his brother more. And Tamaki realizes it after Hikaru and Haruhi realizes she loves tamaki.

No, the twins are not in Любовь with each other. It is just an act for the Host club to attract еще girls. Besides, Hikaru is MINE!!! And Kaoru will be my best friend!!!

YESSSSS

Nah. It's just for fanservice. Like when the host flirt with the customers there it's just for fanservice and money.

Which is why I wouldn't go there. Because they just do it it for money and I would look and feel desperate.

tbh no one really knows but i think hikaru has a crush on his brother because in one of the episodes kaoru says "no way i Остаться в живых again" the girls say "sorry kaoru" hikaru then says "now go easy on him princess,kaoru is quite the crybaby" kaoru then trys telling hikaru hes not a crybaby but gets cutoff by hikaru which says "oh so your gonna denie it huh,what about when the two of us are alone playing punisment games tell us what happens then kaoru~" .
this makes it like hikaru has a crush или a homosexual feeling for his brother