>>3143607>>3143743I know all the promo art shows them being slightly yuri with eachother but no, I'm not buying it. The closest thing to yuri Kirino says about Ruri is that she looks kawaii in the meidoneko outfit, and we all know how she likes to lewd kawaii things. Ruri is the one who actually expresses some slight yuri sentiment. Her drawing of her "ideal future" with the 3 of them at the table, her being the one to actually say she and Kirino are best friends and her later slip about not caring if Kyousuke had sex with Kirino (right around her also saying that Kyousuke belongs to her) subtly hints at her being fine with sharing Kyousuke at least.
The only thing we get out of Kirino on the matter is that she lets her best friend date her brother but she obviously hates it. So I doubt Kirino would be down for direct yuri. The only way I can see it happening is if Kyousuke asked for it, as Ruri already pulled the whole "if senpai asks me to I'll do it" line.
But I still doubt Kirino would be into it. Look at Ayase, she's yandere over Kirino so I'm sure she would love to go full yuri with her but despite Ayase considering herself to be Kirino's best friend, Kirino does nothing that suggests she wants to be yuri with Ayase. Same goes for Ruri.