How do I tween a model with two parts?

https://gyazo.com/b1a9f0df972f5121569b7694ab029fa4

if Value == "rapidbeam" then
			
			local beam = game:GetService("ReplicatedStorage"):WaitForChild("Beam"):Clone()
			local explosion = game:GetService("ReplicatedStorage"):WaitForChild("Explosion"):Clone()
			local hrp = character:FindFirstChild("HumanoidRootPart")
			
			beam.Parent = workspace
			beam.CFrame = hrp.CFrame * CFrame.new(2,0,-2)
			game.Debris:AddItem(beam, 5)
			
			local bv = Instance.new("BodyVelocity", beam)
			bv.MaxForce = Vector3.new(math.huge,math.huge,math.huge)
		bv.Velocity = CFrame.new(beam.Position, Value2).lookVector * 100
		
		
		
		
		beam.Touched:Connect(function(hit)
	
			if hit.Parent.Name == Player.Name then return end
			if  hit.Parent:FindFirstChild("Humanoid")  then
				--explosion.Position = beam.Position
				explosion:SetPrimaryPartCFrame(beam.CFrame)
				explosion.PrimaryPart.Anchored = true
				beam:Destroy()
				explosion.Parent = workspace
				game.Debris:AddItem(explosion,2)
				
				
			local TweenService = game:GetService("TweenService")
			
			

			local innerbeam = game:GetService("ReplicatedStorage"):FindFirstChild("Explosion"):WaitForChild("InnerExplosion")

			TweenService:Create(explosion.PrimaryPart, TweenInfo.new(2, Enum.EasingStyle.Linear), { Size = Vector3.new(15,15,15) }):Play()
			TweenService:Create(innerbeam, TweenInfo.new(3, Enum.EasingStyle.Linear), { Size = Vector3.new(13,13,13) }):Play()

the innerpart wont tween in the first run, but it will stay in Vector3.new(13,13,13) in the second use of the beam

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