33 chapters and no kiss isn't fine. For all we know they never actually got together after Yuzumori grew up and realized that she wasn't gay after all.
Yuri couples who kiss never have sad endings.
It's useless to speculate about how things turn out after the manga ends. For all we know, one of them got cancer and died.
It would be inappropriate for Mimika to kiss Yuzumori when she was too young, and it would be inappropriate for the author to have a time skip of over a decade (especially for only one chapter).
This ending was as happy as you're gonna get in a loli story.