If my sister wants a piercing, can I act as a legal guardian?

D1VADAME
This weekend I'm getting my tongue pierced, but my sister wants to come with me. She wants to get her ears pierced, can I act as her guardian and sign for her? She really wants to get it down with me, not with mum and da. They aren't against it, but you know, it isn't 'cool' to get it done with them. lmao
If my sister wants a piercing, can I act as a legal guardian?
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