Reikoku Vampire Koushaku no Ikenie ni Naru Hazu ga Dekiai Saremashita

Morikawa Ringo is summoned to another world and is suddenly surrounded by beasts and in big trouble! The Vampire Marquis proposes to Ringo, "Give birth to my child." Ringo is imprisoned in a castle to increase the number of vampire descendants. Her partner is a ruthless and heartless vampire! She desperately tries to escape, but her sex with him is just too good...!? A dark fantasy about the strongest ruthless vampire x doting x child-making!? begins! (Source: ebookJapan, translated) Note: The vertical version consists of 12 chapters.