Lots of people really, really enjoy breast play.
To deliver a surprising warm sensation, you could take a sip of hot tea before gently sucking on their nips.
And even if your partner does want you to play with their breasts, you should handle them with care: While one person might like to be lightly bitten, another may find that kinda painful.
It should feel real, and she should love everything you both are doing together! To make this extra kinky, you can gently restrain your partner.
One of the things that most guys do wrong is push their chances, and hurry through the process.
If your partner has inverted nipples, which approximately do, you can lure the nipples out with touching, kissing, licking, and gentle sucking, but you might have to work a little harder.