My game is solid, but I have no idea how to pull off a threesome. Got offered to smoke with some chick and a mutual friend tomorrow night. The girl who offered is into me I'm pretty sure, and I have no idea about the other one.

My plan was to just caveman this shit once everyone's high and start making out with the hotter of the two (the one who's probably into me) and I figure once things get heavy right in front of the other one I'll just switch to escalating with the other or pull her in. Is there any other way of going about this that I'm missing?