The Seven Deadly Sins 6: Sloth (Patreon)

I'll give you the props for actually building this device, but now that you have it, you just use it endlessly. These days all it takes to get a real cock over to do this to you is the swipe of an app, but no. You just let this do all the work. 

(This was a tough one, but in my research it was clear that the sin of sloth was laziness, and this idea came to me"