What is the ruling on embracing and kissing a 15-year-old boy who is mentally ill—without lust and with no intention of seeking pleasure—with the possibility of prostatic fluid being discharged? And is it better to limit it to shaking hands despite the possibility of this causing distress to the young man?

Kissing and embracing are permissible for someone returning from a journey, and disliked otherwise, unless accompanied by lust, in which case they become forbidden. The emission of pre-ejaculatory fluid (madhy) is an indication of aroused lust. Therefore, you must avoid kissing and embracing that person, and avoid everything that arouses lust.