Great thread!
I do this all of the time to my man. I love sucking his cock while he is doing something totally nonsexual. Of course he gets quickly distracted. I also love for him to watch porn and totally not watch me while I am sucking a load from him. It is so impersonal and dirty.
One of my fantasies is to service a bunch of men under a bar table while they are all drinking and not looking at me. I would just skip from one cock to the next, never seeing the owners of the said cocks.
Piper