My sister told me she liked Medusa.
I said, "Huh?"
My sister said my blow jobs are so good she looks up at the guy's facial expression, and when they look down, they do nothing but stay still.
Medusa Head
Explanation
Explain Bear
Okay, listen up, buttercup. Medusa is a gorgon from Greek mythology. Anyone who looks at her turns to stone. The joke is that her sister gives such good head that guys are frozen like stone when they look at her.