Immortal Me And Eldritch Wife is a Manga/Manhwa/Manhua in english language, MONSTERS series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

The eternally young and immortal transmigrator Lin Ze summoned the tentacled eldritch god as a wife for companionship throughout an endless life….. but will how their own motives impact this supposed life of serendipity?