pinching?

The picture shows Luz delicately (and dreamily) pinching her aunt's thigh, while having a rest and a cuddle on her lap. She used to gently pinch somebody's cheek if approached closely, but as a sign of affection, really, because if she wasn't interested she'd just push you away. Over the past month or so, she has gradually stopped "pinching" and passed to hair stroking and picking on some strands as if to look and feel them (sometimes pulling a little in spite of her friendly intentions).She particularly likes to stroke her brother's hair and though he's not always willing, he does enjoy the new attention.