Jack shrugs. "I told you, I can always go elsewhere for heavier stuff, if I feel I really need it. It doesn't have to be combined with sex, even for me. Or - you know - I could come back home to you afterwards to let you take care of that side of things." He pauses, realising that would mean Ianto having to deal with damage he's just said he has a problem looking at. "Or not. Whatever, it's fairly academic right now anyway. I'm... in a pretty good place right now so I'm not likely to be looking for major pain anyway."
He arches lightly into the touch to his shoulder. "The D/s side is far more important to me than the S/m side anyway. Giving up control, accepting that it's okay to let someone else take charge - and, when it's with someone like you, enjoy the connection and intimacy that brings."
He cocks his head, a thought occurring. "How about the sort of pain you get from, say, strict bondage, or even from just honour bondage - being told to maintain a certain position? Muscle strain, that sort of thing? No actual damage to skin, no redness, no blood. No pressure, I'm just curious."