Now I have another idea. What if the recordings aren't the real Erynn? There's a fake Erynn on the recording, and our MC looked like an idiot again because he thought it was the real Erynn. Erynn was too disgusted by the thought of it being her. And Ethan is a genius and he's bluffing. Ethan only found out about Erynn's first time with Zane
In the end Erynn is gonna turn out to be a virgin

Erynn got drunk, Alexis took her home... Zane hooked up with a look-a-like.
Later Ethan tells Erynn she has a video of her having sex with Zane, starts showing a video of Zane with a tall slender blonde(we can't see her face from this angle), Erynn is disgusted and yells at him to stop and agrees to his demands, her memory is hazy so she just believes it.
Same thing with the MC, he was trying very hard not to look at the video...
After getting rid of Ethan, Erynn is gonna have a clear the air conversation with Zane.
E-I need to give you an explanation why i stopped seeing you and went to prom with Ethan... (tells the sextape story).
Z-Ok... i'm confused... how did Ethan have a sex tape of me and you when we never had sex?
E-Yes we did, we went together to the "whatever party" and we had sex that night.
Z-No... I was there... you kinda disappeared halfway through the party, no one could find you... and uhhhhh... i kinda ended up hooking up with "Erica".
E-"Erica"? "Erica" from history class? The girl everyone kept saying looks just like me?
Z-I mean... yeah, i kinda did, sorry... i thought someone told you and that's why you never called me back...
MC in the sidelines "does this mean i get to claim another cherry?"