Ayesha went back to boarding school feeling rejected and abandoned, with the demand from her husband to pretend to be her daughter and act like the other girls, so no one discovered their misdeeds. As a wife with a Pakistani upbringing she couldn't possibly act like one of the girls, as they were unruly and vulgar, though she wished she could be free spirited like them.
A boy comforted with genuine, warm affection, which was what she needed from feeling so low and hurt. The relationship progressed too far yet she felt glad it had. The sex was nothing like she ever had before, it had been a duty to her husband, nothing more. After having her first orgasm with the boy she fell in love with him.
It couldn't last as she was due to go home in a few months, so until then she was going to enjoy her freedom to act irresponsibly like the other girls.