Arguable.
It entirely depends on the situation, and what Charlotte told him before the date.
Let's assume the writer goes for the "worse outcome": Zak arrives, meets Charlotte, somehow silver tongues her (she is after all now, a lot less on guard with men, especially if the MC is around and she feel safe).
Now, assuming the mother ends up "liking Zak", which she would have no reasons not to at this time, as neither her or the MC knows what a fuckhead he is. She'd had to go on whatever happens during her meeting him.
Now, the date happens, MC was told to either keep an eye out for protection, or not to follow them by Charlotte. Zak is invited by Emma in her bedroom, she spreads her legs and pussy lips, and he pops her cherry...
Alternatively, since as far as we can tell, he's more interested in Charlotte, he'll give her plenty of TLC and "love", without popping her cherry or doing anything indecent, to get closer to Charlotte (which in all respect, would be a lot smarter to do.)
At which point would the MC have anything to do or say in this?
Zak's good at getting women to let him fuck him, can't blame him for that ^_^