I want to take a rusty hoe to your waifu and scrape out his testicles and penis, leaving nothing there but a profusely bleeding whole, before cramming in some guaze to suck up all the blood and keep "him" from bleeding to death.
I'll then take that same garden hoe and cut up the sides of "his" body, scraping out his fatty belly reserves until I have two substantial globs of fat. I'll slip open his chest and stuff them over his pecs and under his nipples, completing his transformation for a woman.
I will shave her hair to let it regrow in a more feminine style, abusing her to weaken her and leave her with a meek, terrified way of responding to the world.
Her transformation into a true, lovely waifu will be complete the day she stands over my laundry, folding it, crying every second, before her tears dry up and leave her never wanting to be a man again.