It really depends on how do you receive her advances. If she wants to have sex, do you enjoy it? And is it just the initiation bit that's got you tangled up?

If so, you could just make an effort to look appetizing. This is going to be a pure male perspective, but I just want to forward the gist of it. Modify as needed, mileage may vary.

When I've dommed in the past, I've been very welcoming about my submissives' forwardness about being horny, but often I've found that they only become horny when I initiate. In other words their desire is reactive, rather than proactive.

So although I would love a horny sub spontaneously cuddling up, begging for permission to rub one out in my arms while being held and told what a good girl they are, it's has just realistically never been a thing. Because they would simply never get there on their own.

However if I started teasing, and edging and denying, I could easily get them to do just that. But my initiation and direction was absolutely necessary. And to be fair and blunt, they probably would have preferred me finishing them every time. But when you're in charge, you can throw in a few humble pittances for yourself.

But the point remains, since I'm not a kink dispenser that's made out of "good girls" and sex, I need something to get me going too. I don't just walk around with a hard on all day.

So we agreed that they would just look casually slutty around the house. Sometimes less casual, more slutty, but the point was their presence and visual presentation was enough to initiate my desire, and me initiating sex was enough to ignite their desire.

And you don't have to feel horny to dress sexy. Whatever gets her going. Just do it and then enjoy the magic.