Well there's the speedrun explanation of his ability and why he ended up in that world specifically, through the most lackadaisical god possible.
It's fun seeing the cow girl literally getting so jealous of the actual cows that it makes her go back into lactating. Now who will fall next? The bunny girl or the cat girl?
"I can produce milk like a regular cow, even without getting pregnant" - Of course, regular cows only produce milk when they're pregnant or have a calf to feed... this would've made more sense if the author had just left out the reference to regular cows.