To be honest, I have not read Muller's article in full, although I have read the document in full. So I'm not sure how close my ideas are to Muller's. They may or may not be close.
So marriage is associated with sexual intimacy. In fact this is one of the core and unique elements of marriage. This does not mean that a non-sexual marriage is not a marriage, but I am confident claiming, for example, that 99.9% of married couples have had sex with each other. This is the rule, and exceptions do not disprove the rule. If we take up my hypothetical where sex is a sin, a priest would not be able to bless a marriage on the basis of there being 0.1% of marriages that do not involve sexual relations. Sex and marriage are so closely related that separating them is academic and misleading.
A Catholic couple that is dating is ordered towards marriage and ordered towards sexual intimacy and procreation, and this is why we call them a "couple." We would say they are a monogamous couple
in fieri (in progress, or on the way towards fulfillment).
The question then is whether a same-sex couple can be a same-sex couple without there being a romantic or sexual aspect to their relationship (or their future civil union). Or in other words, the question is whether Merriam-Webster's definition of a couple is erroneous. Again, this was the same issue I raised in my first post, "The only conceivable way to read the document in a non-contradictory way would be to assume that it is directed at gay couples who are intending to live chastely, but I think this would be an enormous stretch."
It is a stretch because it flies in the face of societal expectations and societal norms, and beyond this, it is not clear whether such a thing is theologically or spiritually coherent (i.e. attempting to live in close intimacy with someone of the same sex, as a "couple," without engaging in sexual behavior). Such an idea does exist, but it is a tiny fringe in the Catholic world. If
Fiducia Supplicans was directed at this tiny fringe, and yet did not mention or appeal to this fact, then the document would remain enormously misleading and confusing. I see no evidence that is was directed to this fringe movement.
The secondary question, which I may have raised earlier, is that if this has to do with chaste couples then it is a blessing for friends, and not for "couples." A blessing for chaste friendships would not be limited to two persons, but more importantly,
a chaste couple is not in an irregular situation, and thus the grouping of the document would make no sense. The document groups couples in irregular situations with same-sex couples because it assumes that both are engaging in illicit sexual acts. The background and impetus of the document doesn't make sense if we don't assume that a "same-sex couple" is generally engaging in sexual acts.
The document is meant to address this issue, and it is closely related to the same-sex issue.
Yes, something like that.
Yes, I agree.
Yes, exactly right.
Well, the people are the object of the blessing, but that doesn't mean that the couple is not being blessed. When a priest blesses a marriage he is simultaneously blessing the people in the marriage and the marriage/union itself. The document consistently talks about blessing the couple, for example, "What has been said in this Declaration regarding the blessings of same-sex couples is sufficient to guide the prudent and fatherly discernment of ordained ministers in this regard..." (#41).
I would say that a blessing of brothers blesses both the brothers and the brotherhood they share. The blessing is not intended to affect the individual persons independently of their brotherly relation to one another. This is why you approach the priest with your brother and he blesses you both simultaneously. Else there would be no reason to do it that way.
Here is the blessing for a married couple outside of Mass (
link). If you read the simple blessing, which is
not a renewal of vows, you will find that language about their union, their commitment, and their common love permeates the blessing. It is not at all a blessing of two individual persons in their separateness. It is not that they "just so happen to be married."
A priest could bless two people at the same time, but this does not mean that the two people are a couple. When a priest blesses a couple as a couple, he is doing more than merely blessing two unrelated people simultaneously.