Switch and Tangle!

In 1973, Steven Tyler is dating a redheaded groupie, Caitlyn Jackson. Except not really. Caitlyn begins to lose interest and recruits her identical twin sister, Coryn, to attend the dates that she either can't, or doesn't want to, go to. After a few weeks of this, Coryn and Steven begin to fall for each other. Or, well, Coryn falls for Steven, Steven falls for Caitlyn. So now Coryn loves Steven who loves Caitlyn who is really Coryn and Caitlyn is with someone else and wants her sister to break up with Steven as her, but Coryn decides to keep being Caitlyn when she's with Steven since she's in love with him and he's in love with her twin. Oh the tangled web we weave, when we practice to deceive.