That wrenches a groan out of her, almost a growl, fierce and appreciative. Almost impatient, and seeing an apparent invitation, Ylva reaches down with one hand to try to slide her hand into Erin's panties. She doesn't look -- she is far more interested in having her mouth and other hand busily engaged with exploring Erin's skin as much as possible -- so she has to go entirely by feel, and as consequence it's a slightly involved process to get her hand in the right place to shove the fabric to one side. Eager, she slides her fingers between Erin's folds, over her clit.