[Despite how absolutely amazing Ian's fingers feel in his hair, Souji's trying his best not to let on how much he's enjoying it. As he speaks, there are occasional quick intakes of breath, a shiver or two, and obvious tensing of his muscles. By the time he finishes, he's nudging his elbow into Ian's side, because while he doesn't mind that sort of thing, Ian's definitely pushing the line of how much Souji is comfortable doing in public. Even going this far has been a bit of a stretch.]
I'd rather not think about that sort of thing. You might give Kiseki ideas.