The two have a serious facial resemblance so they would be great in a sisters or roommates scenario. Hopefully with some girl-girl kissing and touching.
And not a scenario where the dude is doing one girl behind the other's back. Maybe they could be rivals trying to win the dude over with their sex skills individually before deciding to combine forces and share him. Or maybe he is resistant to their charms at the beginning so they combine their powers to break down his will and then they enjoy 3P FFM for the rest of the movie.