@JesusK
I believe in the United States that’s called a “Romeo and Juliet Law” or something along those lines. I only remember because there’s like a 10 minute tangent in Transformers 4 where a 21 guy uses it to excuse himself dating a 17 year old girl after Mark Wahlberg threatens to go to the cops over statutory rape charges.
In this situation, there wouldn’t be any risk of legal action because both individuals are over the age of legal consent at this point. Maybe there would be an investigation by authorities since she WAS a student of his just prior, but there doesn’t seem like any evidence to back up the accusation.
I believe there are special exceptions in place in just one district in Japan where the legal age of consent is like 14, and at least one state in the US where it is 12.