This aspect in Libra is definitely more romantic than sexual. The North Node person is always emotionally stimulating for the Moon person. You feel comfortable in each others company and relate easily. Since this connection is very spiritual, it needs to be supported by other, more physical aspects in order to work long-term, otherwise it can produce the feelings of regret and as failure in timing.
Here this is what our report says about this synastry: “Emotions and an urge to nurture may play a prominent part in the relationships that you as a couple have with others. You may judge these people not by logic, but by feelings and intuition, and may be easily upset by what they say or do. It’s also possible that your interactions with these people may have an emotional impact on your feelings for each other. You might see your partner through the eyes of these people, and if the impression is unfavorable, it could create a rift between you.You probably spend more time with your partner than with these other individuals, so before you try to make drastic changes in your partnership, try to cultivate people who think that both you and your partner are great human beings. You might then discover that you have no problem at all.”
Hope this resonates a bit!
IF it’s within 3' this is excellent, in fact I have this with my partner and does suggest a karmic link and learning lesson for you both