Forbidden Relationship, Forced Love Between Best Friend and Gangster Uncle

Looking for a Book with Two Heroines Who Love Each Other and Cultivate Immortality (No Need to Be Modern)

I want to watch something like "Senior Sister Qing Leng raises a spiritual pet, a shark!" Book. Please let the two heroines in the book be sweet and pamper each other and become immortals, and don't want to be modern.