Oh no :( I'm so scared thinking about the moment they're having sex and it's just...kind of fucked up and weird but okay, it's Steve, and suddenly something happens that makes Sam realizes it's DEFINITELY NOT STEVE, he doesn't know why or how but it's not. But he's already tied up or something and he just has to wait it out until the sex is over, while trying to pretend he still think it's Steve. Maybe he even realizes who it really is.