Shiori broke up with her i guess..
She's still young and it's not her first time, it's only her "first time with a girl", her feelings for Touko are like momentary feelings
I know these kinds of relationship, they doesnt last long :/
* sorry I still wanna say more and more but I'm not so good at English to describe my all thoughts T_T
And the first time I read this doujin, the title told me it's going to be a bad end, I already knew it, but that last page still made my tears fall like crazy, I can feel what Touko feels ;-; i'm not gonna look at that page ever again ;_;