Looking for these partner swap stories
Read these awhile back but could not find again, hoping one of you might know:
Couple swap amongst friends, I recall the setting was winter at a cabin/lodge in front of a fireplace (apologies for the vague description)
An apocalypse, I think zombie, two couples are surviving and they grow closer. Through some flirtation throughout the story they agree to swap partners.
If any of you have any leads let me know. Or if you have any recs you’d think I like, I’m all ears, thanks!