Best Undected Fly Script

local player = game:GetService("Players").LocalPlayer
local mouse = player:GetMouse()

function Fly()
    local dummy = Instance.new("Dummy", game.Workspace)
    dummy.Name = "FlyingDummy"

    dummy.CFrame = player.Character.HumanoidRootPart.CFrame

    local attach = Instance.new("Attachment")
    attach.Parent = player.Character.HumanoidRootPart
    attach.Name = "FlyingAttachment"
    attach.Position = Vector3.new(0, 0.5, 0)
    attach.Orientation = Vector3.new(0, 0, 0)

    player.Character.HumanoidRootPart.CFrame = dummy.CFrame

    player.Character.Humanoid:ChangeState(11)

    repeat
        wait()
        dummy.CFrame = CFrame.new(dummy.Position, mouse.Hit.p)
    until not player.Character or not player.Character:FindFirstChild("HumanoidRootPart")

    attach:Destroy()
    dummy:Destroy()
end

mouse.KeyDown:connect(function(key)
    if key == "f" then
        Fly()
    end
end)