Cats and wasps is about how things you cannot have can be nice and terrible. With a focus on allergies as a way to get this message across. I personally also see it as a way to portray losing people. For whatever reason, and the different ways it can make you feel about them.
I'm allergic to cats
But I want to be their friend
It's just a matter of fact
It really depends
I'm allergic to wasps
But god, I fucking hate them
They do nothing for no one
To love one is a sin
All these things I can't have around
If I eat seafood it'll put me in the ground
All these things I can't have around
If I eat seafood it'll kill me