Thy tongue, thy face, thy limbs, actions and spirit
Do give thee five-fold blazon. Not too fast! Soft, soft!
Unless the master were the man. How now?
Even so quickly may one catch the plague?
Methinks I feel this youth’s perfections
With an invisible and subtle stealth
To creep in at mine eyes.

– William Shakespeare

Twelfth Night, Act 1, Scene 5. Olivia is a little surprised and even upset that she has fallen in love with Cesario. But she can’t deny her feelings. The irony is she loves another woman disguised as a man. What attracts her to Cesario are actually Viola’s womanly characteristics that shine through her disguise.