That shoulder-touch in Small Worlds is oddly enough, my favorite Jack/Ianto moment :)
There’s nothing to indicate that Jack wasn’t touchy-feely with Ianto prior to Cyberwoman (or, any less then he was with the other team members.) I think, after Ianto's obvious discomfort/shock/whatever at having Jack touch him in a non-sexual manner Jack decided that Ianto doesn’t like casual physical contact, and really refrains from it from there on out. Until about TSE this holds true, where right before Martha’s phone call, Jack had thrown his arm around Ianto when Ianto’s reading from the computer screen.
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There’s nothing to indicate that Jack wasn’t touchy-feely with Ianto prior to Cyberwoman (or, any less then he was with the other team members.)
I think, after Ianto's obvious discomfort/shock/whatever at having Jack touch him in a non-sexual manner Jack decided that Ianto doesn’t like casual physical contact, and really refrains from it from there on out.
Until about TSE this holds true, where right before Martha’s phone call, Jack had thrown his arm around Ianto when Ianto’s reading from the computer screen.