Mettaton thought it was cute, not weird. It even made him laugh. Softly at first, then a little louder. It's so funny! It's...it's adorable and loving and why is he sobbing now?

"Sadness is...such...an awful feeling..." he manages to get out between breaths. He considered shedding his robot form to cry real tears, but what would it matter? Real tears weren't going to bring Papyrus back, no matter how many he shed. He could make an image of Papyrus out of his own tears if he wanted, but that would hurt more...