[Sam had given up on telling people they shouldn't have brought gifts. Apparently Dean had made death threats or something... So he just smiled up at Cas and was grateful for the covering of his dignity after the strippers by the big red box]
Thanks, Cas. I'm glad you came.
[after his talk with the angel, he had been worried about him, Dean and Jo being able to be in the same place at the same time. Nothing had exploded yet though.]