Ianto almost snidely retorted with a comment about his youth more than making up for his lack of experience, but when John looked at Jack, he did too. He wasn't entirely sure how Jack felt about this.

Ianto was, essentially, whoring himself out in exchange for Hart's help. He'd done it before, with Jack and Torchwood. He suddenly realized Jack might not like this situation very much.

Jack had, after all, only reunited with Ianto a little more than a week ago. He might not want to share the Welshman, no matter the situation.