Ianto's expression pinches as if he can't quite believe the other man's offer -- except he can because there he is, standing with a bottle of sunblock in one hand, motioning him forward, but Ianto feels a bit rooted to the spot. Here he is, gone from trying to pry details from him about what all he had been up to with Jim and now he's offering to, what, apply his sunblock for him, and Ianto feels more than a little confused and conflicted by the sudden change. At least, it feels like a change for him. Maybe John is working along some train of thought that he can't follow.

"Why are you doing this?" he asks, after a long moment's pause. He's not going to say no to the help, but everything about his interactions with the other man the whole morning have felt off. Ever since he met him on Jim's threshold.