Everybody thinks that Nico is the one who swears, but Nico is from the 40's. And i dont think that they swear like that in the 40's.
Just imagine how Nico LEARNT to swear. When Nico was was in CHB, he was 11. So he must have learnt those words from other campers, right?
Now imagine Pipee, Jason and Percy finding out that Nico learnt those swear words from other campers. They made it their mission to track down the campers and punish them.
Nico didn't care in the first place. Untill he realised that he learned a lot of the words from Will, who was swearing all the time. Especially when he was curing campers. Nico tried to hide it from Piper, Jason and Percy. He tried not to swear. But hanging out with Will all the time made it difficult.
One day, when Percy and Piper were walking around the camp, they saw Nico with Will. Will brought a camper inside the Apollo cabin while saying that Capture the Flag was "to dangerous" and he was muttering a few swear words. Nico followed Will inside.
Piper and Percy looked trough the window and saw Will trying to cure the campers leg. The camper screamed and moved a lot. After a while Will lost his patiente and yelled: "LIE STILL MOTHERF-"
Nico kicked Will in his leg. "Hush," Nico said. Will immediately shut his mouth and Percy and Piper were still looking through the window.
"So it was Will... Jason was right, " Piper said.
