Ayesha, who has been in Walford since December, tries to seduce the married postman while wife Zainab is out of the house.
Only in Albert Square temporarily, Ayesha is residing at the Masood household in preparation for her arranged marriage.
A source told the Daily Star: "Ayesha is not the mildmannered, naive girl Zainab thinks she is.
"She's a sizzling seductress who knows exactly what men want and uses that to get her way. She's got Masood in her sights and she won't stop until she gets him."
The insider added: "Nina leaves in March so this is the start of her exit storyline and fans can expect a few more twists before she goes."
Shivani Ghai, who plays Ayesha, joined the BBC soap in November.