I've read a review saying May can dfk from 1-2 years ago, but so far I've had 3 sessions and no dfk. She doesn't kiss on the lips much at all, you get a kiss and then she quickly turns her cheek and tries to guide your kisses away from the mouth, more towards her neck. But, she is the closest thing I found to satisfy my frequent hot-young-foreign-asian-chick craving, so I'll keep repeating with her.
From what I've read, Hannah is completely flat, where is May is at least a B cup - not A like listed on the website. To me, thats pretty important. If sensuality/dfk is more important for you, then go for hannah.