Asriel: Mom Mom look I'm not a flower anymore!

Toriel: //laughs// That's amazing, Asriel!

Asriel: //hugs her// Now I can finally have my 13th birthday! 

Toriel: //stiffens// Wait, does that mean you'll age..?

Asriel: //looks at her, puzzled but smiles// Yeah!

Toriel: .... //turns him back into flower// MUST STAY BEAUTIFUL