I'm planning to play a drow warlock in D&D 5e, and since there's no official entomancer (Insect-themed spellcaster) class (it exists just as homebrew), I'm trying to make my own version.
My character is taking the Pact of the Chain warlock option, and chose the imp familiar because it has the best stats. I intend to use the imp shapechanged, and I took the Golgari Agent background, which expands my spell list to also have the giant insect spell.
This same background gives me a pet spider, so I was wondering if I could target my shapechanged imp with the giant insect spell once I was able to cast it?