This update was about breaking Nicole. She still treats MC like a kid since he's irresponsible, childish, immature and came too the beach unprepared, the ending sex scene is where he charmed her pants off because of his blind love for her, this love she has for him seems to overwrite any negative qualities about the MC.
The fact that he admitted he loves Nicole more than her own daughter was pretty hot and that didn't seem to phase her from pouncing on him, in fact it made her want him even more! This update was to setup all the pieces too follow up in the upcoming episodes. I am going to guess that the next update will have the MC finally telling Nicole of John's behavior and him cheating on her.
Nicole seems to believe John is a saint and would never cheat on her and how she's the bad one in the relationship (not completely innocent, but the lesser of the two here).
The dialogue during the sex scene would suggest SHE was trying pleasure the MC by sucking him off like a lover and riding him for HIS pleasure, using her body to get him off and grabbing his hair for passionate kisses, her body language is different as she's slowly succumbing to his advances. She is at a point in her life where she HAS to make a choice now, which is why the very last scene of her walking into the ocean was representing her failures in life but I am sure MC will use this situation too his advantage. I think she feels that she's failed Chloe more than John, by having sex with her boyfriend (as well as committing adultery...). This is the perfect time for MC too drop his Ace in the hole and reveal all that is true to manipulate the situation to his favor. He can bring up the fact that Nicole didn't want MC seeing her daughter so instead he pursued her, he can use the knowledge he's gathered on John to tell her that it was actually HE who had abandoned their marriage a long time ago by sleeping with other women.
They've already discussed what would happen if John found out and both choices tell Nicole that he would go above and beyond to make them work as a couple. They are not officially a couple as Nicole doesn't view it that way and I think the next update will solidify their status since it's all on Nicole now to make that choice. The ball is in her court now and she has too make the play, next update would suggest it being an information dump and Nicole coming too terms with the situation she's in.
Honestly cannot wait for the next update! Things are heating up.