This would be the story of how Darcy and Jane fall in love with each other in between (movies) bouts of world-saving.  It’s a love story told in cups of a coffee and quiet caring and support.  Big gestures are unnecessary when every little moment tells a story of adoration carefully nurtured and grown.  The epilogue would be Thor bringing Valkyrie back to meet Jane and Darcy and idk if it would end in happy foursome or just the duo giving approval of Thor’s potential queen.