I agree that vik used her coz Nimmo didn't know his intention but as far as Kunal is concerned we can't say he's using her..coz she knows what he's up to...she's doing it for Kunal coz she wants to see him happy....I don't think even Nimmo thought that she would fall for Kunal...
BTW do u see that Natasha has turned all 😈 overnight....what's with that???
Vikrant used her to get Naina back and i suspose Kunal is doing the same but she had agreed in the beginning to help him, but now tht she loves him its hard to keep up her end of the deal.