Okay, after some intense research (watching the gif for several minutes), am I the only one who thinks that's more of a 'thigh job?'
Unless Sir Thomas is dressing wayyy to the left, her hand seems a tiny bit off center, so to speak.
Chinese censors, maybe Sir Tom had a charley horse, and his sister was trying to massage it out. Maybe Lucille was suffering from - Anon can attest - a bad case of 'Tea Shoulder' - a stress injury caused by making so many cups of poisoned tea. Her brother was easing the stiffness...with his lips.
See, just a normal familial relationship.