It was a peaceful night in Gravity falls. Dipper and Mabel were sleeping soundly when suddenly, a big crash was heard.
"Wah, huh?" Dipper said, as he woke up from the crash.
"Silence." Said a huge horrible mythical creature that was bird shaped. Dipper was just awoken by a giant magic harpy.
"What do you want from me?! Just don't hurt my sister!" Dipper said as he turned to his sister who was still sound asleep and was completely unaware about the giant harpy in the middle of their room.
"Dipper Pines, you have been summoned by the harpy gods," The harpy said. "You have 2 options. 1, you can be our sacrifice and battle a thousand sirens or 2 you will have 3 breasts."
Dipper, the perverted awkward 12 year old twin boy smirked. He always wanted to know how it's liked to have breasts. "I WANT THREE BREASTS!" Dipper howled at the harpy. The harpy used it's wings and flapped them around and blew Dipper into a dark hole. All of a sudden Dipper awoken again.
Dipper looked down at his chest, and poof three breasts appeared. He smirked a whole bunch and as a pervert he was he grabbed those boobs and squeezed them as hard as he could. He howled a little trying not to wake up his sleeping sister. He felt a rush bulging in his pants. He had a huge erection in his shorts. He grabbed his erection and zipped his fly down, and he masturbated with his other hand. He never felt so good, it was better than the first time he met Wendy. Just then a fountain of cum bursted out of his cock. "Oaha." He moaned, it felt so good to have breasts.
Later that day he tried to hide his breasts from being seen by his sister, Soos and Stan so he put a pillow in his shirt.
"Dipper, have you been working out?" Stan asked. "Yeah, why so buff, cream puff? Haha." Mabel joked.
Dipper awkwardly giggled then said, "Well I want to have muscles kinda, so.. how do they look?" He started flexing.
Stan and Mabel were dumbfounded, but then they just laughed. "Haha, Dipper this must be a joke. You're just so puny." Mabel giggled.
"Yeah, what are you hiding under there, pillows?" Stan laughed. Mabel and Stan were hysterical. Dipper stomped away.
He went to the bathroom and took away the pillow from his chest and he saw that his boobs grew 10 sizes. He gasped. He then suckled on his feminine nipples. Then he masturbated again. This time his cum shot up to his boobs and covered them with cum. He licked it off his boobs. He then went to the sink to wash up. Then he placed the pillow inside his shirt. "Hmm, this pillows too big," Dipper said. "Maybe I could stuff my vest in my shirt instead." He took his vest off and put it inside his shirt.
He then went to his room to read the number 3 journal, but then he felt something growing in his chest. His breasts grew more and ripped his shirt. He then borrowed one of Mabel's sweaters and stuffed his vest inside. But his plan failed as his breasts grew bigger and bigger and bigger. He couldn't scream for help because his breasts made him suffocate somehow. Then POP! A bunch of Dipper's guts plopped all over the room.
Dipper was dead.
The Harpy then soon appeared into the room and looked at Dipper's dead flesh. "He should've battled the sirens." The harpy said.