Byleth/Shamir, Ignatz/Marianne, Raphael/Hilda, Claude/Flayn, Seteth/Catherine, Leonie/Lorenz, Petra/Cyril, Lindhart/Lysithea, Manuela/Hanneman, Annette/Mercedes
All planned. I was amazed at how confused people were with the closest allies functionality. It was implicit to me that this was what determines the paired endings.