The Best Guardian Angel Supernatural Story from The Golden Legend: The Miraculous Protection of St. …

The Story: Cecilia's Angelic Guardian and the Crowns of Chastity
St. Cecilia, a noble Roman maiden of the third century, was renowned for her beauty, piety, and devotion to music—singing psalms in her heart even amid worldly clamor. From childhood, she consecrated her virginity to Christ, but her parents arranged her marriage to Valerian, a gentle pagan youth of equal nobility. Cecilia, torn between obedience and her vow, prayed fervently for divine aid.
On their wedding night, as the feast's revelry faded and the couple retired to their chamber, Cecilia knelt in secret prayer. When Valerian approached her with conjugal intent, she rose and confessed: "O sweetest and most loving husband, there is a secret I must reveal to you. I am not my own, for I am kept by another—a lover who guards my body with jealous zeal. He is an angel of God, appointed to watch over me. If you touch me with impure desire, his wrath will strike you down, and you shall perish in your youth.”
Valerian, stunned …More

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In Principio shares this

"The angel placed one crown upon Cecilia's head and the other upon Valerian's, proclaiming: "These crowns I bring from the gardens of heaven, gifts from the Almighty for your chaste and faithful souls. Guard them with spotless hearts and pure bodies, for they shall never wither, nor fade, nor be seen by any save those whom chastity delights."

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"Show me this angel, then, and I shall believe. If he is of God, as you say, I will worship him; but if not, I will do as I will with you."