As I said, I just phrased it badly. Illusion was a poor choice of words; what I was trying to say was this: my sub likes to be tied up on the floor, I prefer him tied to the bed posts (mmm...so sexy). Some days I'm going for my pleasure and he gets tied to the bed. Other days, my real goal is his pleasure, so I will tie him up on the floor- but I don't say "Let's do things your way today and I'll tie you on the floor", no, he'd go soft in ten seconds and probably cry, if I said that. Instead I'll say "You don't deserve a nice soft bed, get your ass on the floor under Mistress's feet, where you belong." And then he gets nice and hard and his ears get all red and that does please me, plenty! So it's not the activity (where he's tied) that matters as much as his mindset (believing that absolutely everything I do is always for my own selfish pleasure, when that is not quite always true).

I do hope that makes it more clear!