He's about to give him a hard time about it, honestly, but it isn't as if Five hasn't already shown on several occasions to care for him. When the teen wraps himself up in the blankets Klaus just shifts, rolling onto his side so that he can continue to keep an eye on his brother.

"I mean, you're right about that. Paper thin walls." He's sure everyone heard all his dirty laundry during his teen years (not that he cares, honestly).

He drops the back of his head to the back of Five's neck absently -- he knows that's one of the places that cool skin feels best when you're feverish like this -- and then decides, grudgingly, "If you're tired, then get some sleep. I'll crash whether you're in here or not." Which is almost certainly not true, but it's the thought that counts ... right?