[Mettaton gently pushes Asriel's hand away from his. It could be interpreted as him swatting Asriel away from him out of anger, but for the words that follow.]

It's sharp. Don't cut yourself. Please...

[For a moment, he sounds like himself. But then he switches back to that hollow tone. He's at least got the good conscience not to smile anymore.]

I got close enough to get hurt. I need to stop making that mistake...haha...hnnn...

[Mettaton averts his gaze, and that sick feeling welling within him threatens to overtake. He hates it. He's not human anymore...why does he feel this extremely human physical feeling which had been the most horrible part of his one-week experience?

...Maybe it's not human. Maybe it just felt human at the time.]

I'm tired, Asriel. I'm so tired.