Chrom/femavatar
sumia/Frederick
vaike/maribelle
cordelia/gaius
Lissa/libra
virion/olivia
sully/henry
nowi/gregor
lucina/Gerome
lon'qu/panne
nah/morgan
kjelle/inigo
owain/severa
All done on my first playthrough,they're not the best pairings apart from the first one.