The S-Rank Serpent I Abandoned EscapedEpisode 4

Researcher Thea studies serpent-folk on an alien planet and mistakes Nyx, a lone ancient Black Wyrm, for an ordinary snake-man. She teaches him courtship rituals, making him regard her as his mate. Terrified after learning his identity, Thea flees but is captured by Nyx. They uncover their forgotten childhood encounter. After misunderstandings and twists, they reconcile, welcome their hybrid child and stay together.