This is all truly interesting. Sothis and Rhea's exclusive supports with Byleth has me really curious, I wonder how/ or if their supports with Byleth will be tied directly to the main plot. According to IGN, Sothis and Rhea's supports could possibly be non romantic. I wonder if paired endings are a thing, doesn't seem likely but I would welcome it if they did go in that direction. One thing is clear Rhea and Sothis definitely have some kind of connection to each other. Looking forward to having all me questions answered.