Yeah, this retreat is more a holiday to get some quality time away from the busy city life, for both couples. And what better company than the two couples together? So yeah, this is a romantic holiday, and the marriages are fine, I would say.<br/><br/>Maybe during the holiday, the two brother-sister pairs also spend time together, where they inquire about each other's marriages... and tell each other what they've discovered about their spouses, like their likes and dislikes and little habits. Over the course of such heart to heart talks, maybe they realize the old feelings they had for their brother/sister haven't completely vanished.<br/><br/>Since Matt and Marie have gone all the way, maybe we should keep Jack and Jenny's relationship still not consummated. Maybe only after Marie's (or Matt's) confession about their past, Jack (or Jenny) consider doing it too.<br/><br/>Maybe Marie and Matt do it once more after marriage, and then decide it is time they told their spouses about it.<br/><br/>Keep them ideas coming!