Are doubts and thoughts about the existence of a child resulting from adultery, despite the use of a condom and seeing semen in it, in addition to other obsessive thoughts related to guilt and blaming oneself for the actions of others, considered to be from obsessive-compulsive disorder (OCD) or from the whispers of Al-Khannas (the Sneaking Whisperer) that cannot be gotten rid of?

Adultery is a grave sin, but no matter how great the sin of a servant, Allah accepts sincere repentance that fulfills its conditions: abstaining from the sin, regretting it, and resolving not to return to it, while concealing oneself. This is based on the Prophet's (peace and blessings be upon him) saying: "Whoever commits any of these abominable deeds, let him conceal himself with Allah's concealment."

You must achieve repentance and turn away from the whispers of Satan, for sincere repentance erases the effect of sin, as the Prophet (peace and blessings be upon him) said: "The one who repents from sin is like one who has no sin."

As for gifting the bed to the aforementioned man, there is no harm or sin in it, whether he lives alone or commits a sin upon it.