I respond under the control of our Master ORSologist, but it seems unrelated to me.
Until this very last update, Lena can NOT cheat on Ian with Jeremy. The very last scene of the very last update is the very first time you can. And for this, after having played according to our scientist's guidelines, I think I really know the minimal conditions now:
- You NEED to be on the cuck path. Having already cheated on Ian is not enough.
- Ian needs to be on the war path with Jeremy, ergo: Lena must have cheated on Ian at least once, because the only way you are on the war path is because Jeremy tries to warn Ian about Lena cheating, and Ian gets super upset, twice.
- Ivy's party blowjob is no longer relevant. Actually, you now can have refused to blow him, and still suggest him for the threesome, not earlier but on this update.
- If Lena and Jeremy messed around at the club, that implies Lena has woken him up, meaning she has declined a relationship with Ian, thus it is not cheating.
Even less relevant because:
- Lena can have woken Jeremy up, have the threesome with him and Louise, fooled around with him at the club, and yet, if she decides at her parents' house she wants to commit to Ian, then she stops seeing Jeremy, can still suggest him for the threesome, and yet she will at best fool around with him on the last scene without going all the way, and only if Ian has allowed it.
- One last interesting point, worth insisting upon: if faithful Lena chooses to persuade alpha Ian to fool around without him, even if you are not at all on the cuck path, you get the cuck emoji for the first time. This implies that EK is going to give a new "chance" to your faithful Lena and alpha Ian to get into the cuck path. I did not see that one coming.