Learning to Love- Nagisa x Karma Lemon

I didn't write this and i don't claim to under any circumstances...
EchoedInfinity wrote this and I'm revising the grammar.
One day Nagisa realized why his heart was racing so fast when he was near Karma or tried to look into his eyes, why was he stuttering when he tried to talk to his best friend? Does he have feelings for him?

XX Mature Comment XX {We all know what lemons means, right?}