If there is a beard/threesome possibility for the ending, it probably won't be Sandra. It's not in her nature. Maybe the idea of an absent girlfriend/present twin sister is the plan, but I'll be more than a bit surprised if the game takes that route. Pretty much any other character could be written into it with a little work, but Sandra's the one who couldn't without making her a very different person. Frankly, Beehive wouldn't be into being seen as attached either, which leaves Lisa and her...sister, is it?