I'm not sure how far the manga will follow the web novel but basically the couple will live in Selgigios (country blessed by Green Dragon) and they'll have citizenship and special titles since they have gained blessing from 2 dragons (from Blue dragon & now Green Dragon).
Fran originally have blue dragon's blessing from his family's lineage (their family's role is to be a secret balance checker family for royalty, shadow of royal family) so he have incomplete dragon's claw [3 claws] with a different glow from his right eye [dragon stone eye] but now he was also given green dragon's claw blessing forcely through left eye to protect Farah after the dragon war.
They have adopted a daughter Farah (one who is shunned by everyone for having a curse that can't use dragon stone tools) but in fact she has the holy glow which strengthens guardian dragon's power, just like prince Twilight of Braxilios and Rifana (the b**** Alsegios prince's exchange for that causes MC engagement annuled as fiancé).
Fran's younger brother Kulgan, the 3rd son who have the complete set of dragon's stone eye [both eyes] & dragon claws [6 claws] on his back, is the one who inherited their house and who will succeed him as guard for the Arsegios prince (from Blue Dragon country) but unfortunately he wants to leave to where his brother is since he have a crush on Farah (already proposes to her) & the Alsegios prince is an arrogant idiot.
There will be an evil dragon appear that led the black, blue & green dragons to fight together against it. It happened in an event where the prominent persons from 3 dragon countries are all present.
Can someone spoil this for me