I'm no help on the actual art of the thing, but it seems to me that a tattoo like that would go well on the upper arm, except you probably couldn't go sleeveless at work anymore. Side of the torso has good surface area, but crappy visibility for casual viewers (I'm thinking under the braline, essentially).

Thigh? You don't hardly ever wear shorts/skirts, so it would be no issue for work, and would be a lovely surprise for those people who do get to watch you take your pants off for the first time. Also good surface area, and you have nice legs, honey.

Hmmm. Only difficulty with that is you've talked about putting your lion tattoo somewhere around there, so maybe on opposite legs? And if done less-than-optimally, it can just look like a ginormous bruise on your leg...