"shall blush for me"
Irony
Act 1,
Scene 4
Lines 30-32
Mercutio
Benvolio
At a masquerade, because one’s identity is hidden behind a mask, a lot of flirting goes on, causing the other person to blush (which is also hidden behind a mask). But Mercutio is being ironic — it would take a lot to make him blush!