Draconic Persuasion( Races of the Dragon, p. 104)
Your arcane talents lend you a great deal of allure.
Draconic Heritage (RDr) , sorcerer level 1st,
After you cast an arcane spell, you gain a bonus equal to 1-1/2 times the spell's level on your next Bluff, Intimidate, or Perform check. The check must be made before the end of the next round.