Oops! I Got Knocked Up by My Sworn Enemy! [AI BL]

Plot: Bitter sworn enemies Viking lord Holger and Light Elf prince Eilan lose their memories in an icy lake. Mistaken for lovers by villagers, they fall in love, bond under the aurora, and conceive a son. Eilan fakes a miscarriage to sever ties when memories return, hiding the child for 4 years. A dark elf kidnapping reunites them, unearthing the truth and mending their age-old feud.