I was bored and this was the result
Have fun with it
It was the springtime
The birds were chirping, the flowers were blooming and everything in Magnolia was just beautiful. Natsu decided he wanted to go for a walk to kill some time while Lucy was on a mission with Levy, Gray was off with Elfman, and Erza was off killing something. He walked for awhile and passed many springtime sights, freed stalking Laxus while he read a book under a tree, Cana drinking in the park, and Wendy picking flowers a little too enthusiastically. He ventured into the deep emptier part of the forest and there he started to realise that he itched
Down there
He thought about why and remembered why he liked the springtime so much
He was in heat
Igneel had told him about this, and how in the springtime the animals would go into heat and feel the urge to mate
As he continued his walk, the urge got bigger and bigger until he almost started with a tree
"I can't do this anymore, wait this part of the forest is always empty, so what if I…"
He rushes over to the other side of a tree away from the path so that even if someone came around they'd have to actually go into the dense forest to see him. He sat down and pulled down his pants releasing his cock, big and hard. He grabbed it and started to pump up and down.
"Oh yeah, unnnnggggg"
Quite a few more similar sounds followed and he rubbed his rock solid cock. He pumped faster and faster, and harder and harder until he cummed all over himself spraying his torso and the forest floor with a lot of cum. But his cock wasn't done, and before long as he sat there, the itch, and the erection came back, asking for more.
"I could go another round"