A Grain Of Salt — Sarah A. Hoyt

Being dead doesn't always mean being safe from all troubles. For Fang Hui Heng, who wakes up in the dreaded place of punishment, having been contracted in grave marriage to a ravishing stranger, death is the beginning of all his troubles. But if he succeeds in his adventures in dreadful legendary hells, is reward might be bigger than anything he could imagine.

A short story originally published in the anthology Better Off Undead.