Well, I like making my sub cum. Eventually. I like crushing his cock and his balls with my feet (in very very high pointy heels of course). I like walking on him. I like making him crawl round the room while I ride on his back or walk him on a lead. I love, absolutely love, making him put my 'walking shoes' on for me. I love simply having him kneel in front of me - he loves to be on his knees in front of me, and I love seeing him there. But most of all, I love the look of complete adoration he gives me, when I'm mean, when I'm nice, when I look after him, when I get him to serve me, when I tease him... and that adoration makes me want to give him pleasure; and apparently he gets greater pleasure from me than from anyone else he's ever been with, so I must be doing something right.
There is little D/s; he is totally not into virtual, and we can only see eachother seldom. There's no deep mental thing about it... he's a very experienced sub, he's very open about what he wants (sometimes too much so: I have to ensure he is not running the show). Still, even though he is my first sub, and he's so experienced, I have still been able to introduce him to some new things, and that, too, is a real buzz. It's not a constant search for 'new' - but knowing what it's like as a sub, the anticipation, the nerves, the butterflies - I am very pleased to be able to give that to him, too.
And I like doing a few things I know he doesn't like, to test his willingness, to give him the opportunity to do something for me, because he is deeply submissive and he also appreciates being able to do that.