Took a few days of procrastination but finally read the wall of text. I like how he mentions Hahari-san's beauty mark twice lol.
Thank you Alphatm for translating all that!
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went to the link: https://www.pixiv.net/en/artworks/74653585
It's really roughly drawn, and I'm not good enough to translate it but I think I can get the gist of it?
Here's the TL;DR:
Longer version, translated in page order:
"but I hear you moaning all the time!"
"you're eavesdropping on me?"
who wanna bet she just turns the table on him and it never gets addressed again because she moves on to a different prank?