Harry seemed close to loosing his mind Hermione observed as he moved between them. She had the urge to put on a little show for him as he touched her and tenatively reached out to touch Ginny.
Panting as she stroked him and he fingered them both, Hermione let her free hand wander onto Ginny's body, caressing her arms, her neck. She turned herself slightly so she could see Ginny better, watched Harry's finger sliding in and out of her, "is she as excited as I am?" she asked him with a grin.
Lowering her mouth, she kissed Ginny softly on the lips, waiting to see if the younger girl was okay with Hermione playing with her as well as Harry.