Wow, this is old Yohane, though the afterword unfortunately doesn't seem to mention what year - just the month and day. This kind of Aya x Reimu with Aya being the flustered one and Reimu keeping her cool is nice, too.
Its adorable with those moments plus their reaction, story have this quiet intimacy.
Really wish the author release all of their in one big translated book sigh, will pay a high price for it.