The classroom

Luckily, class was still going on and the corridors were empty of students. Alice walked past Class 3-G but was stopped by a loud noise from within.

She looked inside. One of the male students had knocked his desk off and was fumbling to pull off his pants.

"What the fuck? There's something crawling in my pants!" Shocked faces turned into laughs as the students mocked the boy's visitor.

Only to be shocked again once they saw the bright neon blue slug perched over the boy's ass like a claw ready to strike.

"AIEEEE!" The slug dove in, piercing through his undies like plain paper and began worming its way into his asshole. The **** of it was so strong, the boy stumbled and fell face forward onto the floor.

"SOMEBODY GET IT OUT OF ME HNGGGH!" He tried desperately in vain to pull the intruder out, but it was persistent and had burrowed its full mass in, only leaving a rim of blue fluid behind.

The boy then began flailing about, bones creaking and joints bending as the parasite took over his mind. He began foaming at the mouth, blue bubbles forming. His dick turned blueberry blue, growing in length and girth to accommodate its new host. His balls also began to glow a fluorescent blue.

Finally, the flailing stopped. The rest of the class was too terrified by what had happened to even considering moving.

The infected rose up, erect dick pointing to the sky before the rest of his body followed.

"SEXXX! PUSSY! BREED!" The infected howled, diving for the closest woman.

That was when all hell broke loose.