Personally, about the only thing i can say from sure from the latest chapter, is that Reika cares a hell lot about Kurono, enough for his rejection to put her in the state of irrational anguish she's was in towards the end. She's clearly not thinking straight, and the closing lines are deliberately ambiguous to boot. Is the last bit Oku being a dick (i.e. creating some artificial suspense by waving an unlikely scenario in front of us) and telling us there just might be a way for Reika to get her Kurono without having to anger lolipe... i mean Tae Fans by having the mouse killed, or is it a genuine possibility he's highlighting?
At any rate, what i took away from this chapter, is that if Reika ever did get Kurono, as long as it's not foul play (i.e. actually killing tae, or letting her die, or something) then she deserves him as much as Tae - what she feels for him is more than skin deep infatuation, and Inaba indicates clearly that Reika has men waiting to fall for her in stacks, so she goes for kurono out of a genuine aprreciation of who he is, both on ("I am immortal") and off (Tae... "sniff") mission. From what kurono said, he likes Reika and Tae equally, it's just that Tae happened first, and he's gonna stay true to her. Of course, that's assuming he gave Reika a straight answer.