[Well, if Ren's letting him continue then he sees no reason to stop, and as Ren moves his hair, Shun turns a little so he can get a better view. There's not really much left to look at, honestly, but since they're in the middle of a conversation he might as well use that space to cover more ground, so to speak.
When Ren makes that remark, though, Shun stops in his tracks. He doesn't exactly look outright surprised, but he does look a little wrong-footed...however, he also doesn't move back any, instead just turning his attention back to Ren's face.]
If you think it looks like that, you could've stopped me from doing it. [...Okay, so he didn't actually ask, but he would've backed off if Ren had been uncomfortable with it.]
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When Ren makes that remark, though, Shun stops in his tracks. He doesn't exactly look outright surprised, but he does look a little wrong-footed...however, he also doesn't move back any, instead just turning his attention back to Ren's face.]
If you think it looks like that, you could've stopped me from doing it. [...Okay, so he didn't actually ask, but he would've backed off if Ren had been uncomfortable with it.]