I second that Serenata, a lot of those series that end in subtext at least one of the girls could easily say she's lesbian but it always end as het friendship, because you know, it's normal for straight girls to be extremely gay with each other, on #Nohomo, worst offender in that is Nanoha, it's pretty much unspoken canon that Nanoha and Fate are a couple, sure yuri is not the focus, but it feels they never outright say it just to sell merchandise to male otaku that want them as waifu, Love Live is other, the writter is female and did yuri before, if anything at least Maki x Nico is pretty much canon, they sing about each other, their duet is about mutual attraction, the valentine day pics they give chocolate to each other while other girls give to unknown person.
Nevertheless, here yuri is defined as “the overdone affection between two girls peculiar to girls in puberty,” adding that it is “a limited-time pseudo love”
"pseudo love" because you know, girls can't love girls, really, japanese should stop with this bullshit and make a magazine that is explicity for lesbian stories, sigh.