What is the ruling on a married man who committed major sins with a young man on a Ramadan night without penetration, and what is the expiation for that?

What the mentioned man did is a heinous sin and a great evil, and it becomes even more sinful in Ramadan, as sins are multiplied in virtuous times and places. There is no specific expiation for this act, but one must frequently seek forgiveness along with sincere repentance, which includes abandoning the sin, regretting it, and resolving not to return to it in the future.