Eh, I feel like good yuri kind of has to be consensual, if only because yuri works best in a fluffy, adorable, 'purest form of love' presentation. I'm not saying it has to be that way, there are plenty of more serious and realistic directions to take, but this one does neither. It isn't realistic OR sweet. It has bad character interaction with no redemption, drama without consequence. The end result just seems... well, crappy.
Now, look, I know it's just hentai, but if it's all the same, why not just give it a happier ending to fit the mood, or subvert it fully for emotional impact? Is there a reason not to?