Write a fictional first person narrative that has a man named NAME_1 swap genitals with his wife named NAME_2 while having sex by magic. It turns out his wife had caught NAME_1 cheating and wanted him to suffer and feel what it was like to be fucked by his own penis. NAME_2 fucked NAME_1 while NAME_1 begged for her to swap their genital back. When NAME_2 finally orgasmed inside of NAME_1, she told him she had just made the swap permanent by doing so. 