Chara blinks and straightens their back as the other seems like they're going to fall, but Frisk catches themself before they can make any further response, and seems fine, so they don't. They do make a mental note against trying that again - this playing feels like it's on eggshells, and they don't want to ruin whatever is happening here.

They respond in kind with their own tongue, with the demeanour of someone sneaking something from the cookie jar, and wriggle it a little, before ducking their head and looking away.

They're keeping the other Frisk's reaction out of the corner of their eye, however.