Then why is his mom being treated like a love interest then?
Is she or is it just wishful thinking from you as a player?
Rather certain the MC can or has kissed her on the lips and even tells her whether or not to date a guy....
Well, if that's all you need to call it "treating like a love interest"... A quick kiss on the mouth of the mom is in many western families a normal thing and has nothing to do with romantic or sexual interests. And it's also normal that many single moms asks their kids if they should date someone. Especially if it's someone like John who has a history with her son. Sure, emancipated and progressive woman don't ask their kids, but many woman does. Both points you mentioned doesn't make her a LI.
unless it turns out she is not his biological mom.
No, it can't turn out. Like you can read in the game is was clearly mentioned that Emily gives birth to MC. Melissa was with her.
Has the game dev made other games where she teased sex that never came with hot characters?
No, it's her first game and I don't see teasing. It's a game in progress and that means you can't say what is teasing and what not. Last but not least it's not a porn game where you get all pussies you can see. It's an Adult Visual Novel. It's not called for nothing NOVEL.
Emily is hot and obviously I do not see her as my mom so...
That's a you problem. If you had read and not just skipped most of the time you would know she's MC's mom and it absolutely doesn't matters how you look at her.
Is the only "solo Elena" choice after the club with Lay? To have to progress that far with Layla only to reject her just seems fucking mean
Yes, it's the only way at the moment we can see in the game and I for myself thinks you can't get in Elena's pants this way. Elena will beat the shit out of MC for breaking her best friends heart. Elena is clearly overprotective with Layla. Maybe there will be another way in future updates, maybe I'm wrong and Elena gets Layla's blessing. We'll see.
Nikki is almost 100% pregnant. A sexually active woman throwing up is like Chekovs gun.
Many players think that. I think it's a bait. Morning sickness during pregnancy isn't as common as Hollywood makes it out to be. It also usually only occurs from about the third month of pregnancy. Nikki isn't that far yet.