Watashi wa Gotsugou Shugi na Kaiketsu Tantou no Oujo de Aru

Octavia is a fujoshi princess, originally a high school student who was reincarnated into her favorite novel, "The Noble King." In order to solve the successor problem of this "BL world," the princess was going to enter a political marriage and offer her own child to the king– But she doesn't want that at all! For a fujoshi who has yet to know what love is, she'll find her fated partner in this world she's reincarnated to! The supporting character princess will cut through her fate, an other world reincarnation love comedy!!

(Source: Kadokawa, translated)