Roland secretly used mental suggestion, not only on Yukio but also pulling Haruno into its influence.
Oh, and Mrs. Kawasaki, the driver, too.
To be honest, Roland wouldn't have minded if his family was just messing around together.
But having an outsider watching while his family was acting so shamelessly and disgracefully? That was just too embarrassing and unbearable.
He couldn't fathom how Yukio, who always prided herself on her strict adherence to tradition, could act so foolishly in front of a stranger, that too in front of her employee.
If this got out, the Yukino Family would lose all face, and Yukio would never be able to wield any influence in the society again.
So, for safety's sake, he decided to bring Mrs. Kawasaki under the mental suggestion's influence as well. The suggestion he gave her was: Don't mind if everyone fuck together~.