"Frank heard a laugh behind him. He glanced back and couldn’t believe what he saw. Nico di Angelo was actually smiling." House of Hades (minuiko)
House of Hades. This is so accurate besides the fact that they're happy.
I just finished the book the house of Hades and I was like Leo is in love !!! And then I felt really bums / smart because the part where he meets calypso and the raft dosent come but then it does it's because she started liking him !!!