My friend has some explaining to do

So I was reading the hunger games (The first book) and it was borrowed from my friend since I do not have the actual book.and I was reading at page 311 I was reading the bottom part and when I read the part of Peet’s pulling Katniss in for a kiss I noticed that it was underlined

I think she likes them together. It’s obvious that she underlined it because even though I constantly write in my Harry Potter books 📚 I wouldn’t dare write in a book that I borrowed. To add on I just saw it there so it makes me think that she did it LOL. She obviously likes them together.