If Christ is a bridegroom...

Luther finds lots of wonderful implications from that metaphor.

…if Christ is a bridegroom, he must take upon himself the things which are his bride’s and bestow upon her the things that are his. If he gives her his body and very self, how shall he not give her all that is his? And if he takes the body of the bride, how shall he not take all that is hers?…

Christ is God and man in one person. He has neither sinned nor died and is not condemned and he cannot sin, die, or be condemned; his righteousness, life, and salvation are unconquerable, eternal omnipotent. By the wedding ring of faith he shares in the sins, death and pains of hell which are his bride’s…

Who then can fully appreciate what this royal marriage means? Who can understand the riches of the glory of this grace? Here this rich and divine bridegroom Christ marries this poor, wicked harlot, redeems her from all her evil, and adorns her with all his goodness. Her sins cannot now destroy her, since they are laid upon Christ and swallowed up by him. And she has that righteousness in Christ, her husband of which she may boast as of her own and which she can confidently display alongside her sins in the face of death and hell.

(from "the Freedom of a Christian," in Three Treatises, cited in p. 207 Leithart, Peter J., "'Judge Me, O God': Biblical Perspectives on Justification", in The Federal vision)

And amazingly there is plenty more in that metaphor if you think about it.