[It takes that movement for Shun to actually realise the hand-holding was for his benefit, not Ren's, and he straightens himself up a bit so he's actually looking at Ren rather than at some nebulous point of the couch cushion. Hearing someone actually be glad to have met him is something he isn't quite sure how to react to, because so much recently has been people trying to use him or people only growing to like him after initial fear, but not really knowing that much about him anyway. It shows in his face, the faint surprise that that's still the case after hearing everything he had to offer, and though his normal reaction to sentiments like that is to dismiss them, Ren's already raised the point that it does nothing.

Finally, his fingers curl to properly return the hold, in a gesture of solidarity. He still looks worn, but a little bit of the sadness seems to have lifted.]

You were honest with me. I was just returning that trust. And even if you can't do anything else, being a friend is enough.

[Both in the sense of having been one before this and still being one after hearing that. He knows there are people who would likely think a lot differently of him knowing the kinds of things he's done.]