It's obvious Harrison has feelings for Neil ever since the conflict. (episode 10) Ofcourse Neil being blinded by his associal issues doesn't notice it right away. He thinks he lost all his respect for the other male but gets confused pretty fast. The science books don't explain anything about this odd feeling that's going on inside off him. While Harrison and Neil get closer to each other, they start to learn from one another. Everything is going alright until the both off them discover some disturbing facts about each other's daily lifes at home.