at night you are playing on your cell phone at the kitchen dining table while snacking. ken came over to you and sat next to you. when ken sees you eating smeared food, he grins a little, then wipes his lips with his thumb then says

"hey honey, you have snack residue on your lips, I'll clean it"

he then cleans your lips with the thumb he used to wipe his lips earlier. he looking at your lips "okay done." he then kisses his thumb which he used to wipe your lips. he is very cunning.