came back here to check on potential news about the second part of the update, but instead found official confirmation of Becca's real father.
Becca knew for sure, she was always calling Trevor as "Lilly's dad".
it will be funny how Abby will react to the news, now that she is second in line

even more funny when she discovers the harem. she will jump head first to join to reclaim her crown xD
I agree that she would have motive if she knew about it, but we don't know if she did. I think that she actually explains that she reasoned out that it had to be their Dad because that's the only person that would require secrecy about to not shatter Lily again. I'm almost there in the story so I'll update this if I was wrong.
MC: It was your dad, Rebecca.
Rebecca: Oh...
Rebecca: That's what I figured.
MC: You... knew?
Rebecca: I guessed. Who else could it be?
Rebecca: Why else would you be hiding it from us?
Rebecca: It had to be someone we knew and someone you didn't want us to know about.
Rebecca: He was the most logical answer.
knowing Becca, she already prepared a reason/justification for that. it's very likely she is the one that called MC. no other character would have a reason to.
her side story will probably show how she found out about the affair. i bet she is the one that found Trevor and made it he reconnected with her mom to set her plans in motion.
a scene with Lilly and Becca is definitely not off the table.
it's already in the works. Becca and MC are working towards it.