It is not so hard to trick 14 year old boys who have had a decent upbringing. They don’t walk around expecting to be sexually assualted by a teacher and they are not warned about male and female perverts like girls are.
I am glad he trusted his mom to tell her. A lot of parents have attitudes of betrayal towards their sons so they don’t tell out of shame and guilt for getting tricked. It screws them up.
I know... it just seems to me that if he was expecting a cheerleader and in the dark he grabs someone who is about 100 lbs heavier than he was expecting, it would only take a second or two to think “Hm, something is wrong here.”