Is it permissible to place a pillow on the penis to encourage a wet dream with the aim of relieving sexual urges?

One must avoid thinking about nocturnal emissions (wet dreams) because it arouses lust and may lead to falling into temptations. This could be one of Satan's steps that drag a servant towards masturbation. A Muslim should adhere to the Prophet's guidance concerning sleep and occupy himself with beneficial deeds and thoughts. The Prophet (peace be upon him) encouraged young people to marry if they are able, and for those who are not able, to fast, for it is a protection for them. Allah Almighty says: (O you who have believed, do not follow the footsteps of Satan. And whoever follows the footsteps of Satan - indeed, he enjoins immorality and wrongdoing. And if not for the favor of Allah upon you and His mercy, not one of you would have ever been purified, but Allah purifies whom He wills, and Allah is Hearing and Knowing).