I Am Seeing A Potential Child Exploitation

Ok so we all read in class 9. Ok so there is this one girl in our class current age is 15 and she WAS the classic teacher's pet but the thing is she is not anymore now. This part may not be useful but still added it. And let's name the girl as 'D' ok. So we all knew D had a special relationship with our school president (let's name him E). Now by special relationship I don't mean something bad, I only mean that D's family and E's family is very close. But recently I have noticed that D has been obsessed over E ( D is a 15 year old and no 15 year should be this obsessed with a 40 year old who is not even a family member). We are close friends and we poke each other and when ever we say something in the lines of "Would you like it if you were locked with E in a room?" To D she answers immediately "yes". And many time D goes to E's room on her own and some back 30 to 40 mins later. Now you may think I am thinking too much but one day when D and I was texting eachother. This exact topic came and D was obviously very defenceive of E and then D send a screenshot of a convo of her and E in which E was literally saying "I love you" now you can say this is ai or fake but she is not that tech savvy and the screen shot was very realistic.

Edit:- I spoke with one of my friends and on his advice I am adding this additional context. As I previously mentioned D was a teacher's pet. Now she wasn't a typical pet who is good at studies, she is good at studies but not that much. Many of us knew her family's good relationship with E's family therefore many students were jealous of her and still is. They tried to harm her by defacing her and a whole lot more. But E being the president (he has alot of power) all ways supported D and sided with D. Therefore D feels a sense of gratitude towards E. This is the whatever E does is good to her eyes. But in this very way E can manipulate D and exploit her. Location: India