The delicate arch of the back as they push forward, the soft angles of their smooth stomachs, the cute way they position their arms and hands and the lovely form of their irresistible legs.
I like things that I find to be cute. It just so happens that what I fond cute, most would call sexy. Whichever label works is fine with me.
It might be a look on their face, the position they're in or even the clothes they're wearing, it's all cute to me.