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Things Not Seen by Andrew Clement
I distinctly remember reading this in first grade because my teacher did this thing where you had to read to her for her to judge your reading capabilities, and I started to read aloud the part where he talks about his #2s not being invisible and I was embarrassed to read that out loud lol
It's been 20 years or so for me. But I recall that they are not #2s. Because they are invisible they are renamed to be #4s!!
OH haha oh my goodness, I do remember him going into what #3s and #4s were but in my embarrassment I must have misunderstood! Thank you for correcting me :)
Uh, are we talking about pencils or poo?
Poo :P
That's it thank you so much!
Yeah this was 100% required reading in my language arts class growing up. He starts a relationship with a blind woman too. And the company that manufactures the electric blanket knows about the issue and pays him off to keep him quiet.
This was the first result returned when I searched your description. https://www.goodreads.com/book/show/542752.Things_Not_Seen