She never had those feelings for anyone, so Kyou is not a special case. it's the same as all the other people she ever dated.
She literally said that no matter how cool or kind the guys she dated before were, she wasn't interested in them at the start. Meaning she dated them simply because they confessed. Just like she did with Kyou. She claims that evetually she started seeing them in a romantic light, but she also said she never fell in love wtih them. That doesn't sound that different to her relationship with Kyo, and in fact, Kyo is shown in one ofthe panels when she's talking about this.
I think using him as an example of how she deals with all her relationship and the emotional range she's capable of is plenty valid. If anything, the fact Kyo was a dear friend to her instead of a random man like all her previous relationships should make him even more likely to have Eri more emotionally involved in this relationship than her previous one. Yet, she wasn't emotionally involved at all. Or sexually involved for that matter.
She literally tells Fuyuki she's not interested in kissing her, and while she's sure she will change in some way with time, she never claims she will be able to fall in love with her. She's hopeful, but she does admit she might not be able to fall in love, and is aware that might kill the relationship.
And that's kind of the take away here. It's fine to be hopeful but we can't ignore the obstacles both of them know they will have to face.
