No... no, this really isn't doing anything, is it? Shinji's more than willing to wait for however long, but this isn't changing a single thing. Two handholds were only as effective as one handhold, which probably wasn't doing much for Kai in the first place.

He doesn't want to tell Kyoko to stop, not if she doesn't want to, but she shouldn't have to feel like she needs to do this if it's too much. And judging by the look on her face when Shinji steals a glance over to it... this might be her limit.

So, he tugs gently at her hand to get her attention, voice barely above a whisper as he speaks, "That's enough." She doesn't have to push herself to keep this up.