Sara's Love VS Sesshomaru's Wish
This is a tragic love that is destined to have no ending from the beginning.
Sesshomaru saved Sara by chance, just like he had saved Xijian by chance. Facing Salo's willing repayment, what he said "whatever you want" may just be out of curiosity to know what her so-called "own wish" was. This was a dispute caused by his personal thoughts, so Sesshomaru would say to Inuyasha more than once: This matter has nothing to do with you.
Sesshomaru is by no means cold-blooded, but he is not a warm person either. He will never give away his tenderness easily. He clearly knows what he wants, just as he clearly knows that Sara is just a demon walking on a piece of human skin. He may just have a little extravagant hope. When the "wishes" come true, when the horizontal sword is blocked in front of Inuyasha, he has realized that important people can only be protected by his own hands.
Suo Luo was a poor woman. She never expected to stay together for a lifetime, but in the end all her efforts proved to be mistakes.
There is nothing wrong with love, it is the way of love that is wrong. Sara is still the Sara who loves Sesshomaru, but Sesshomaru is no longer the same Sesshomaru who resents Inuyasha.
As a result, all that Suoluo could leave in his heart was the lingering and resentful flute sound.
In the end, ashes will return to ashes and dust will return to dust.
Conception: