My initial reaction was that that sounds awful, but thinking more, I can kinda see it. Mascarpone, lemon and orange - that's basically a fruity cheesecake. Vodka just makes it more alcoholic. The basil is a bit odd, but I've seen herbs on desserts before, and it could give a interesting contrast in flavour. Definitely expecting it to be one of those cocktails that is more dessert than drink, but there might be something there.
The martini was good until they but blue cheese in it. That stuff is foul.