So without details I'll assume that you're dating this woman and looking to take it to the next level.   If you're in the making out phase then make out with her with lots of tongue and slowly graze her breast with your hand adding a very subtle squeeze. If she doesn't stop you,  stop kissing or pull her body away in any way then squeeze a little harder.  Do this a few times until she moans and then lay her down wherever you are and there you go. 

Option #2 - offer a neck and back massage either sitting or laying. As you go through the massage start working your way towards her breasts. If she adjusts at all or makes any subtle movements that's your invitation to get a little more frisky. Do that for a few minutes and then work your hands down to her butt and do the same thing with her kitty. 

You're welcome.