It's not torture, but he wants very much to just be able to be clean for a while and covering himself in more sticky, slimy, oily lotion is not what he would consider in that category. He gives John a look and then fumbles to catch the bottle as he lobs it in his direction. Managing to look a bit sheepish as John continues after that.

You're welcome. Yes, alright. So John's been doing a lot for him and Ianto's been. Well, complaining a fair amount about their situation. And probably not as outwardly thankful as he probably should have been. He has thanked him though, hasn't he? A couple of times, at least. He recognizes that he would have probably collapsed from heat stroke out there somewhere if it weren't for the other man, he really does, and if he's focused more on his own inadequacies than on his gratitude for John's calm and steady presence guiding him through all of that, then he is sorry about it. Does John -- regret that? Is this his way of being aggravated with all of the complaining, he has to wonder?

He fumbles with the sunscreen for a moment before glancing back up at the man. How even to begin to respond to that? "Thank you," there's a start. "Sorry." There's another. "I..." He glances away, knowing he's said a lot of it already. "I don't mean to... I am grateful."