Immoral stepmother incest: My stepmother is defiled

Sayuri remarried her dead sister's husband and lived a happy, albeit modest life. Kazuya, the son-in-law, is confused by his extremely beautiful mother-in-law, but he also harbors a faint love for her. A sudden tragedy befalls the family... Kazuya's classmates suddenly come into the house and rape Sayuri right in front of Kazuya. "My stepmother..." Kazuya was acutely aware of his own weakness, and Sayuri suffered the greatest humiliation as a woman. What will be the fate of these two? ?