Gotta say I'm with Sara on this, it's not very 'friendly' to manipulate people into a position you want them to be in and which they obviously find uncomfortable. If you told him, you give him the choice, if you don't then you have in effect backed him into a corner where he'll have to be pleasant but not enjoy himself, and if you do that he's unlikely to ever come to your place again when invited in case you do the same thing again, so you'll have shot yourself in the foot.