What is the expiation for an un-married young man who has sexual contact with his sister by touching without defloration? Is this considered zina (fornication/adultery)? What is the correct way for him to repent? And is he obligated to conceal himself?

1. The person mentioned must perform sincere repentance (Tawbah Nasuh), which involves abstaining from the sin, regretting it, and resolving not to return to it.

2. There is no expiation for the perpetrator of zina (fornication/adultery) except repentance. Both he and his sister should increase their good deeds.

3. If penetration did not occur, this is not considered zina that necessitates the prescribed punishment (Hadd), even though it is a grave sin.

4. The perpetrator of the sin must conceal his own sin and avoid being alone or mingling with his sister. The sister must also repent and conceal her sin.