Yes, the breasts are s*xy and sensual, but remember that they ought to be handled with care. You should not go on the attack and pounce on them like they are squeeze-toys.
Do not make a beeline for them as soon as foreplay begin. Let your fingers gently touch the skin around the nipples and the surrounding areas. Once the nipples harden, you can stroke them to pleasure her more. This anticipation will greatly up her excitement level.
You should always make sure to listen to her body. Gauge her responses so you can figure out what she likes. Watch for increased breath sounds that proves she is enjoying what you are doing.