Adultery என்னால் தாம் எல்லாம் என்னை மன்னிச்சிடு சங்கீதா அம்மா.

[Sengolan]

Every story writer deserves his own opinion. You are not understanding the character arc of the mother and son in the original. The mother after that fateful night tastes sex and craves for it. She is not a victim or innocent. Her son has conflicting cuckold and possessive desires. This is the crux of the story.