I would like this too, but it's not gonna happen. Oda doesn't like to display sexual desire in women. Dudes can have their tongues out drooling, but...well, look at hancock.
Does she talk about how attractive Luffy is, how hot his body looks, like Sanji does? No, she fumbles around her words trying to be cutsey like she regressed to being a teenager. The most forward thing she does is ask Luffy to marry her, but even that's not upfront desire, atleast not sexual desire.
I heard some say that Reiju actually performed her version of perversion (heh) when she kissed Luffy to suck out his poison, since it was all sensuous and all. So her sexual advancement is an indirect act that's propped up by a pretense of it being something innocuous. So something like that is the closest you'll get, something like Hancock where it's clear she finds him hot, but won't ever actually put it in the kind of direct and over the top terms her brother displays.
Which is a shame, because that'd be one great gag.