Were the victors right to spare the defeated countries heir just because their kings son likes her?

marshalljames1

Last night I had a DND Dream and I was wondering, were the victors right to spare The Defeated Kings 5 year old granddaughter and heir just because their kings 5 year old son and heir took a fancy to her?

So basically a country started a war that they lost, by tradition regardless of age in this world all the Royals in a defeated country are killed but by sheer coincidence all bar 1 of the defeated countries royals died fighting and the last 1 left is the Defeated Kings 5 year old granddaughter, who by rights is the heir but she was taken alive and naturally she doesn't have long to live

Naturally depression, sadness and hopelessness will always takes its toll on 1's health, especially a 5 year olds health, its not long before the 5 year olds fading away and if she dies her countries royal line dies with her

Just as it appears that she's beyond saving the 5 year old son and heir of the victorious king decides to take pity on her, after all she may be destined to die but at least she can live what's left of her life in comfort

So he has her brought up to his Royal Chambers, naturally she is bound with ropes that are loose enough to not hurt her but tight enough to ensure she can't escape, gets his servants to put her in something decent, and between him, his nanny and his 3 most trusted servants he nurse's the 5 year old back to full health

Even though his initial intent was only to nurse the 5 year old back to full health and ensure that she lives what's left of her life in comfort he finds himself rapidly developing feelings for her, and by the time she's fit enough and healthy enough to be executed he finds that he can't bring himself to hand her over

So the 5 year old son and heir of the victorious king goes to his father and asks him to spare the Defeated Kings 5 year old granddaughter, after all if they kill her she'll be a martyr but if they spare her she will be a puppet queen, which will reduce the chances of the defeated country revolting against the country that conquered them to almost zero