Byleth Sothis TSF ベレト ソティス 性転換過程 (Pixiv Fanbox)

After a field trip to the Holy Mausoleum with the Archbishop, the Professor returns to grade his papers when his heart began to beat... Byleth's body began to shrink while his hair grew to enormous lengths... Not long after, Seiros' plans bore fruit and the goddess returns to the world once more.