Love the GF x Neighbor scenes, the neighbor is actually deeply in love with the GF, the GF might as well live with her at this point, just need to tell their daughter she's her mother, as it's not just sex between them, sometimes they spend time with eachother just making out, I fully expect the neighbor to ask the GF to marry her in a scene soon, and if their daughter knows they're both her parents, she might insist on the 3 of them living together as a family too, maybe even insisting her parents get married, it will be difficult for the GF to deny her daughter that happiness, it might just be the excuse she needs to agree as well.
For the MC my favorite scenes are with the mom and with Zoe, Zoe seems to be in love with the MC, would also not be surprised if Zoe asks him if she can be his second girlfriend (it would be selfish and hypocritical for the GF to be against it).