imagine

A short fanfic or prompt placing a reader insert in a novel scenario with a character or celebrity.

To form a mental image of something; to envision or create something in one's mind.

“Try to imagine a pink elephant.”

To believe in something created by one's own mind.

“She imagined that the man wanted to kill her.”

To assume

“I imagine that he will need to rest after such a long flight.”

To conjecture or guess

“I cannot even imagine what you are up to!”

To use one's imagination

“Imagine that we were siblings.”

To contrive in purpose; to scheme; to devise.