I'm personally hoping the threesome option isn't a tease if it does happen with Erynn but I can't see it happening at the same time. Since Erynn and sex isn't exactly easy for her even with someone she likes and trust.
I also think it won't happen, i don't think it fits their personality.
Sex is a big deal for Erynn, and Alexis isn't exactly the sharing type.
I could imagine a threesome that will end badly... everyone is hyped for it and it ends in a breakup somehow
I can see that too, in fact i think it's the most likely scenario.
Alexis gets jealous quite easily and Erynn no doubt yearns for more than just banging the MC.
One thing that could make this even more interesting is a sex scenes with multiple choices.
Which of the 2 you start kissing/caressing first? Which girl do you finish with? Chose one to cuddle after... That sort of thing... with a strong possibility of leaving one of the girls feeling neglected.
Neglected Erynn would simply mean she falls out of love with the MC, but for Alexis it could lead to a break up.
at least it'd be pleasant dream.
Speaking of dreams, if an actual threesome isn't on the plans... Nyx could throw us a bone with a dream scene.
If the guy can have a very vivid dream about banging Gabi while the Spanish class is happening, he can also let his imagination fly seeing Alexis and Erynn together.