Okay I got some ideas for Fandral x Margaery in ASOMAM :
. Okay so Margaery was warded in the House of Mundilfari for around 2 years as well. And she and Tommen ( whose former marriage was annulled yet remained friends/allies ) came to mingle with the Aesir and Alfheim courts all the while
. And it's also kinda how Fandral and Margaery met. Sigyn ( who is also a cousin of Fandral in that continuity ) is the one who introduced them to each other. Sparks soon flew
. Anyway Fandral is literally head over heels with Margaery and tries to ardently pursue her. His friends all laugh at him for being so ' lovesick ' yet still help him
. Margaery took some time to warm up to Fandral btw
. By the time Margaery meets Loras again Margaery and Fandral are already married
. The 2 got married a year after they met in a beautiful Alfheim wedding