Rose is having a hard time in stopping herself from losing herself in her laughter.
Glancing at Ianto and then over to Jack, a little sheepishly, "Sorry if you thought I was being too mean, but had to really go all out, otherwise his mind would have caught on too easily."
As the Doctor wraps his arms around her she wraps one arm around his neck, the other pulling his face to her, "Of course were alright-you silly man." She kisses him on the cheek and as she pulls away her eyes widen as a thought blossoms in her head, "Does this mean I get to snog other people too...." She smiles a little evilly as she glances across the room at Ianto and Jack.