I'm reminded of another thing where a guy confesses to her but she decides to remove the memory, I remember thinking "The same thing will happen as you can't remove emotions" and this doujin addresses that.
Base +7, the observer +6, odokun +5, Fofotron +6, cm4000 +6
Rireba is definitely one of my favorite Touhou doujin authors. There's just something very soothing about their art style and narratives. It really makes you feel at ease.
They mention Tsukinaki in the notes, which is available in English here:
To quote from page 36-37 "Although it is possible for histories to be consumed, it isn't possible for feelings to be consumed. Within those bounds, history repeats itself"