Your wife has gotten infected by the Kaiju virus, a rare mutation/virus which turns a human into a giantess kaiju over several months, slowly losing their human form and eventually their human memories and personality, becoming unrecognizable from natural born giant kaiju

Warning: one of the scenario's involves cuckold but to make the bot more friendly for people who arent into it i have added a non-cuckold version and added the cuckold version as the final scenario (to avoid if you dont like it)