Pretty sure it isn't. If you're thinking of grooming then again, don't think this meets the criteria. However, I'm no expert on the law so either speak to a solicitor or a tv presenter!!!
That's a bit of an assumption. Firstly, it is not alleged that he is dating Maia and that in itself is not illegal. However you are alleging they had sex with each other when she visited the UK which would be illegal. A quick google and the age of consent in Brazil is 14!!!