There will be an arc where old enemies of Angrboda show up, kidnap Hubby and she will have to rescue her husband.
There will be a Love Rival for Hubby.
An old flame of Angrboda will walk into town and try and tempt her, perhaps even try to make her go back to monster-hunting as a Battle Couple. Angrboda, of course, will be oblivious to their flirting while Hubby will feel the need to fight for his marriage. In the end, Angrboda will realize what's happening, reject the old friend (perhaps even give them a swift right hook which will take them out instantly) and all will be well.