How to make a Shift-Lock like Camera?

I'm trying to recreate shift lock in my custom camera, but im trash at anything that requires math or cframes. I've had a go and I know I need to use lockcenter on the mouse and use userinputservice to check where the mouse is moving, but the camera is messed up. How would I modify this to make it work?

-- Scripted by LifeInDevelopment
local userInputService = game:GetService('UserInputService')

local player = game.Players.LocalPlayer

local character = player.CharacterAdded:wait()

local mouse = player:GetMouse()
local camera = workspace.CurrentCamera

local torsoOffset = CFrame.new(0, 3, -5)

local maxSensitivity = 10
local xSensitivity = 5 -- max is 10
local ySensitivity = 5

userInputService.MouseBehavior = Enum.MouseBehavior.LockCenter

userInputService.InputChanged:connect(function(inputObject)
    local character = player.Character
    local torso = character:FindFirstChild('Torso') or character:FindFirstChild('UpperTorso')
    if inputObject.UserInputType == Enum.UserInputType.MouseMovement then
        local deltaX, deltaY = inputObject.Delta.x * (xSensitivity/maxSensitivity) , inputObject.Delta.y * (ySensitivity/maxSensitivity)
        camera.CFrame = torso.CFrame * torsoOffset  * CFrame.Angles(deltaX, 0, 0) * CFrame.Angles(0, deltaY, 0)
    end
end)