C++ Appending parameter packs

#include <iostream>
#include <utility>
#include <tuple>
#include <type_traits>

template <typename ...Args>
class PackClass
{
protected:
    using Tuple = std::tuple<Args...>;
private:
    Tuple m_values;
protected:
    template <size_t I = 0, typename... Ts>
    typename std::enable_if<I == sizeof...(Ts), void>::type
    walkValues(std::tuple<Ts...> tuple)
    {
    }

    template <size_t I = 0, typename... Ts>
    typename std::enable_if<(I < sizeof...(Ts)), void>::type
    walkValues(std::tuple<Ts...> tuple)
    {
        auto value = std::get<I>(tuple);

        /* SOME ACTION */
        std::cout << value << std::endl;

        walkValues<I + 1>(tuple);
    }

public:
    PackClass(Args... values) :
        m_values(values...)
    {
    }

    template <typename Arg>
    PackClass<Args..., Arg> Append(Arg value)
    {
        return std::make_from_tuple<PackClass<Args..., Arg>>(
            std::tuple_cat(
                m_values,
                std::make_tuple(value)
            )
        );
    }

    size_t Count() const
    {
        return std::tuple_size<Tuple>{};
    }

    auto Fetch()
    {
        return walkValues(m_values);
    }
};

int main()
{
    PackClass{ 3, std::string("TestString"), 'c' }
        .Append(3.5)
        .Append("XYZ")
        .Fetch();
    /*auto result = */;
    return 0;
}