Come upon thee....Luke 1:35
And the angel answered and said unto her, “The Holy Ghost shall come upon thee, and the power of the Highest shall overshadow thee. Therefore also that Holy Being who shall be born of thee shall be called the Son of God.
Like, if taken in the context of a virgin that ended up pregnant, that spells it out pretty clearly. Homeboy just blasted her and rubbed it in or let gravity do work.
Sounds depraved, but we're talking about a book where Lot's daughters date raped him to get pregnant.
Just saying, the Holy Ghost giving Mary a pearl necklace would hardly be the worst thing in the Bible, and it makes it all make sense imo.