The entire school bus was filled with rowdy laughter, all the girls on board excited for their visit to the aquarium. While not everyone has a particular interest in animals or the long drive ahead, everyone was happy that their time had been allocated to go there instead of another boring lesson or class assignment. But in the back, there was trouble brewing. One of the girls sat alone in the far back, looking down at her skirt. Her name was Fumika, and she suffered from a special condition that gave her a big smelly dick. The other students were busy chattering and giggling about how cute the animals will be, but she hid from the commotion, staring at how her skirt slowly rose with each throbbing pulse. As hard as she tried to focus on something else, to let her growing erection subside, nothing seemed to help. And while she had successfully hid herself away from most people's view by sitting at the very back, a few girls nearby began to complain about the powerful smell it was suffusing off into the air. She dared not speak up as she heard them complain.

"Hey... what's that sweet smell? It smells weird." one girl asked loudly enough for most people to hear over the din from the others.

"Yeah, the bus stinks now," said another. "And I feel funny."

A third chimed in: "...like your face is getting hot, right?"

They tried opening a few windows, but they were locked. One of the girls made her way to the front of the bus, and complained to the teacher who sat in the front seat. She was quickly dismissed back, and in the end, the girls were losing interest in figuring out the mystery of the musky scent wafting through their nostrils anyways. A few minutes later they were all chatting again without even realizing there was anything wrong with their surroundings, though they had shuffled a bit further away from the back seats where the mysterious odor came from.

***

An hour into the drive, the bus had become a lot quieter. The Fumika's musky cock smell had spread throughout the entire vehicle; every single person on board could smell it now, and was feeling its effects. The girls at the front were flushed and confused, but for the most part still unaware that something strange was going on at the rear of the bus. As you went further back, the girls were squirming uncomfortably, crossing and uncrossing their legs or spreading them apart to try and alleviate some of the heat that seemed to be mysteriously building inside themselves. At the far back, the most affected girls suffered the full effects of the musk: Their chatter-filled group had broken up, instead almost all of them quietly sat in silence as they subtly touched themselves. The ones with more resistance would spend time running their hands across their chest, lightly toying with their nipples while their faces burned red with shame. The more depraved girls had given up on maintaining any semblance of modesty and just sat with one or two sweaty hands tightly caught between their shut thighs, hazily prodding against their underwear in an attempt to relieve the growing pressure they felt. And then there was Fumika...

She knew she had caused this. The whole field trip was ruined because of her cock's overpowering effect it had on her classmates. But she had no power to stop it. The occasional hushed noises from the girls near her that were clearly struggling not to moan out loud while they touched themselves made her dick unable to help itself; it had only grown harder by the minute. She would manage to go a few minutes without a lustful thought, only to be sent into overdrive when she heard the affected girls.

"H-H-Hey..." came the panting voice of another girl nearby. "Uhh... can I borrow your handkerchief?"

Fumika peeked over the seat to watch the conversation between two girls sitting together, one with chin-length red hair and freckles, and one with long black pigtails. The girl with pigtails looked back with a glazed expression in her eyes and swallowed.

"Umm... sure." she said as she produced the hankie from her pocket. The red-haired one took it from her with trembling hands and waited for her friend to resume looking out the window, before wiping her forehead and then lowering it to her lap to figure out how she could use it to pleasure herself better than her hands.

Fumika stopped peeking over the seat, dropping back into her own. She knew she wouldn't last all this teasing around her until the bus arrived at the aquarium, and even if she did, this field trip was completely done for, so it's not like it mattered anyway. She sighed quietly to herself, knowing what had to be done next. There really was no way to resist it with all these horny girls around. She