Final answer:
The occupational therapist should maintain professional boundaries by stepping back and verbally expressing that kissing is not appropriate in a professional relationship, then document the incident and consult with a supervisor if needed.
Step-by-step explanation:
In response to the individual's attempt to kiss the therapist on the lips, professional boundaries must be maintained. The therapist should politely but firmly set boundaries by stepping back and verbally expressing that such behavior is not appropriate in a professional relationship.
The therapist might say something along the lines of, "I appreciate your gratitude, but I must maintain professional boundaries, and that includes not engaging in physical acts like kissing." It is also important for the therapist to document the incident and, if necessary, discuss it with a supervisor or colleague to ensure proper handling of the situation and to seek guidance on any further action that may be required.