This was a really lovely story. I love best friends to lovers stories when done right, like this one. And this really worked for me.
Pen and Dave had gone through similar things with divorce and their fathers leaving, which brought them closer together. Each thought the other was straight until a confession at their graduation.
The epilogue was the perfect touch. It was nice to see their main families (their moms and Pen's sister, Kari) were supportive!