Personally, I'm all for KumixYuri. I haven't seen Emulators yet, so I don't know what goes on there, but there are quite a few pointers towards a love relationship between the two.
When Yuri loses her memory, Kumi is the only one she REALLY trusts. I think this points to some deeper feeling than just friendship. Also, while she's just kind of 'I'm not sure about this,' towards her memories of Kasumi and Miyu when the Sunflower clan is attacking her mind, when she get's to Kumi she's more definite about her feelings that she's not an alien. (Or at least not one to attack. :P)
On Kumi's side, there's the scenes where she'd in the cafe with Hisagawa-san; at one point she explains her new symbiotic need to be with someone, and later she asks if being symbiotic is similar to marriage. In this case I'm certain she was talking about Yuri. She also seemed to be starting to get closer to Yuri even before her transformation (although moreso in the anime than the manga).
Even Kasumi picks up on Kumi's feelings, saying "You better get her before someone else does," right before the borg attacks Yuri to try to forcefully merge with her.
There's quite a few hints and even blatant displays on both sides throughout the second and third volumes. And besides, they look really cute together.
Almost as cute as Sakaki playing with her kitten.
Or maybe more.
Well, I'm rambling now, so I'll just stop here. LONG LIVE THE CHEESE!