All the characters are 18+ The story takes place at college
Hana is just petite.
Malpractice.
In several countries, malpractice can be consider a serious problem and a despiteful conduct by some medical professionals and other areas. However, Broken Dreams is a fictional story, so let's say in the universe where the events takes place, malpractice is considered a crime (and it should be considered that way in way more countries, but that's just my opinion). The protagonist at that point is not worried about what he did with Kaede, playing videogames? Not a problem at all, he's worried about scalating his future aproaches with her, making them more and more improper. The relationship between a psychologist and a patient must be professional.