Are there any manga with Yuri harem? I don't mean A guy with a harem and some of the girls love each other. I mean a girl with multiple female lovers. Or at least a good long yuri romance.

Iono the fanatics
Shitsurakuen
Oddman 11
Are the only official harem yuri series I know of. There are others with love triangles that feature classic harem antics like falling on top of a naked girl, falling and seeing a girl's crotch shot, etc. Those would be
Tachibanakan -tolie- triangle
Ayame 14
Yamanko! - no love triangle tho