I just want to make one thing clear, all these pairings and groups that are turning up and people are putting together are still only assumptions.
The devs have not stated anywhere what groups are going to happen only that some will.
That said, the Katie, Lily and Deb relationship isn't going to happen overnight. Katie has a lot of jealousy issues to get over and likely won't get into a 4 way relationship until the end of the game.
I've had my fun manwhoring the last 19 chapters, partaking in every opportunity thrown my way, so as we begin to wind down and progress with the plot and the stakes get higher in terms of real consequences for dating all L.I. instead of just pursuing one at a time, I'm trying to get ahead of any awkward encounters and nasty breakups starting from ch. 20 on.
I honestly just assumed after the foursome in the beach house, if chosen, that would open up a shared polyamory path with Katie as the #1, but her accepting Lily and Debbie either as equal parties in the relationship or at the very least, friends with benefits who don't need her permission to get intimate with the MC. That was honestly one of the reasons I was willing to go along with Debbie's plan to confess to Lily rather than just declare my love for Lily outright. I wanted to be a friend to Debbie and not sabotage her love confession while ultimately seeing how open minded both Lily and Katie were.
I guess I should have heeded the hints dropped in Ch. 19 at the beach where even if Katie is flagged as friends with benefits, when talking to Debbie and Lily, she specifically states she is a one-man type of woman and as her feelings have recently changed since going FWB, she doesn't see herself sharing with anyone. At the risk for getting caught cheating on Katie, I guess we can always ride out sneaking around with Debbie/Lily a little longer in the hopes she changes her mind on sharing, but that could honestly go either way. I just want to avoid what happened the morning after the group sex where if you decline pursuing an actual relationship with only Katie, she angrily breaks up with the MC, along with Debbie and a broken hearted Lily who chooses loyalty over love.
I am also curious if the same penalty for cheating includes casual sex with the side girls: Wanda, Jolina, Theresa and even Zarah? So far, I just started my #1 L.I., Jenna's path through ch. 20 and curious if there will be a throuple option with the MC/Jenna/Jolina. We'll see if there is a Lily/Debbie throuple combo available if I'm willing to cut Katie loose. I'd rather lose her and possibly Debbie too, if I can keep an alternate path with Lily as a main L.I.