voluntarily
Adriano a embrassé Rima de son plein gré.
Adriano kissed Rima of his own free will.
Cedric est mort de son plein gré ?
Did Cedric die of his own free will?
— Harry Potter et l'Ordre du Phénix (2007)
Et de son plein gré, j'entends bien.
And of his own free will, I mean.
He did it of his own free will.
Elle fit la vaisselle de son plein gré.
She did the dishes of her own free will.