Translation credit goes to kanramori

For reference, Abigail is 12 years old, while Kotarou is stated to be 15 in the Christmas 2016 event. Billy's age isn't stated, but he died when he was 21. On the other hand, FGO does make him appear younger than he did in real life, maybe as a reference to his nickname (credit to this information goes to the comments on the translation source).

You can hear the sound of Billy and Kotarou's male pride as it shatters with just a couple of words