As I said below: "You get him naked by choosing to help him around the farm in the talk option. Eventually he'll ask you to help but reply instead with you wanting to admire his muscles. You need high enough affection. After which he takes his clothes off."
You get him naked by choosing to help him around the farm in the talk option. Eventually he'll ask you to help but reply instead with you wanting to admire his muscles. You need high enough affection. After which he takes his clothes off