This is the only manga I can think of where "that escalated quickly" and "that took forever" apply in equal measure.
Real talk, though: I like that it's an awkward, experimental first time between two teens. No declarations of love or unrealistic promises about the future or real romance to speak of; just two girls swept up in the endorphins and hormones of too many raw situations in a row learning a bit about intimacy, themselves, and each other.
That cliffhanger, though... Yurizilla is a horrible tease.