without fanfare or coming on to him in some cheesy way.
Without talking
Enter the room while he's here
Lock the door behind you (i'm assuming kids).
Quietly and sensually unzip his pants and proceed to give him oral sex.
Don't ask him to stop surfing don't say anything at all.
When he's done, just go back to the other room. He won't say it at first, but he'll be very quietly appreciative.
You have to give him something to come back to. If you're just bitching that he's here, he'll really have no interest in even trying to talk to you. This is and we are a fasicinating bunch.