Owain could influence a person's body and mind to do or think something when kissed. To do this, he needed to have physical contact with that person, with his lips touching their skin, and thus a person could evade his ability by avoiding this contact. For a stronger use of the ability a kiss on the lips was needed, or a longer physical contact with that person. The kiss could either be passionate or completely chaste, and this didn't seem to make any difference. He could influence a person into doing absolutely anything, and their own personal beliefs and strength of will didn't seem to make any difference.