[That one, simple kiss on the cheek is sweet enough to get her relax even before the finger is gone completely. As for after it's gone, she relaxes more as her eyes follow his hand movements and treat themselves to the sight of his private piece of eye candy (since now it was a pretty hard to not pay attention to) before he moves back over her.
Those sounds of hers pick up again in full force when she feels the tip of his dick press in her. Vocally she starts things with a gasp and soon works up to a moan. Easily any effort she had made to relax is erased in that moment as she discovers just how different a dick was from a finger.]