Maata Draupadi story has been projected as an amorous and incest relationship
Many people ask how maata Draupadi was allowed to marry Pandavas?
Pancha Indriyophakhyanam explains the dharma behind it
Even Drupada Raja was not convinced he asked Veda Vyasa the following questions

He said it is Loka viruddha(opposed to society) and Veda viruddha
He said it was never practised before and it appeared immoral
Even DrushtaDumnya asks the dharma sookshma in it

Vyasa maharishi took Drupada aside and explained the story of Pancha Indras
Yamadharma raja was performing yajna he did not perform the duty of taking the lives, which is the law of nature(Srusthi dharma)
Paramatma assured them that Yama son who will be strengthened++

by the power of devas would complete the unfinished task of Yama. After that, they assembled at the place of yajna, Indra deva saw golden lotus in Bhagirathi. He was surprised and went(to find out) and saw a beautiful lady weeping, her tears turned into golden lotus. Indra ++

said "Oh Sundari who are you and why are you weeping" she took him to the mountains, where a handsome youth was playing dice with a young lady. Indra felt insulted as they did not wish him, He tried to use Vajrayudha on them but little did he knew that it was Mahadeva himself++