I am the DM in a fairly new d&d 5e campaign. In it is a kobold barbarian who was once a dragon-shield in a now destroyed tribe. The black dragon wyrmling the tribe worshiped/protected is presumed dead by him. Another character is a dragonborn paladin of Bahamut who is taking the oath of redemption for a violent nature he struggles to control. Both characters have been bonding a lot over their past failures and desire to be better.
I had an idea that the party could find the wyrmling at some later point, having been imprisoned by someone connected to the campaign's BBEG. They would then have the opportunity to protect the dragon from the BBEG and share their conviction to be "good" with the dragon who would have had an evil tendency otherwise. As a note I tend to treat alignments in sentient mortal creatures as changeable to varying degrees.
Is this a bad idea from a storytelling perspective to give this opportunity?