Again and Again, With You ~The Sleeping Prince Is Attacked by the Reincarnated Librarian~

Tomoyo has no memory of her prior life, but she knows that she died and made a deal to come back to life. The bizarre condition attached to this deal is that she must take in semen on a regular basis, or her new life is forfeit. She finds that the only man she seems compatible with for this special kind of sex is a local doctor called Zac. But one night, Zac reveals that the reason they're compatible may run much deeper than Tomoyo could have guessed. Discover the truth along with Tomoyo of what led to her death in the first place, and what her true connection is with Zac in this dark fantasy.

Official English:
Irodori Comics, FAKKU, Renta, Coolmic