Mineta's growth spurt goes horrendously wrong
Mineta getting a growth spurt is usually to either make him cool and/or to make him realize that his perversion is wrong, but what would happen if his growth spurt makes everything worse? I tried to make a story and this is what i made.
Due to Mineta being depressed of being unable to be as powerful as his classmates and not being seen as 'cool' leads to him to try some other ways to be what he could truly become. Doing everything he could to be just as strong and cool as his classmates but none bear any fruits, so he's about to give up. That is until he sees an advertisement of an experimental growth treatment. He is not sure about that at first, but his curiosity seals the deal.
After multiple experiments he starts to grow into a regular teenager, his hair looks normal and his face becomes handsome just like how he wishes. Thanks to it, he gains the confidence boost that he desired, although some of his friends starts to be suspicious. It's not too long after Mineta found out the side-effects of the serums that he used in the experiments, he started having weird dreams, his perversion becomes worse and the worst of all, he's developing weird aggression and feral behavior.
Kaminari, Tsuyu and Shoji are the ones to notice Mineta's odd behaviors since they're Mineta's closest friends so they investigate it by themselves to make sure that Mineta can be normal again before Aizawa expels Mineta, but something else has happened to Mineta when they enter his room. His nails turns into claws, teeth are now razor-sharp, his purple eyes are now similar to those of felines and he could barely responds to human words anymore. Shoji immediately grabs and hold Mineta to prevent him attacking anyone and Tsuyu and Kaminari are searching for everything behind all of this and they found one last serum.
It turns out that the serum has obvious side effects, turning people into going feral and yet it seems that Mineta knew and kept this secret all along. As they about to take all of the serums Mineta immediately breaks free from Shoji arms and grabs his serums back from Tsuyu and Kaminari. He makes a wide commotion by running all fours from his room and out of the dorm by breaking out the window. Most of the 1A don't know what's going on with Mineta so the three have to tell them the truth and eventually Aizawa had to come in. Mineta is running fast towards undiscovered forest as what his dreams and mind are telling him and after he safely in the forest he uses his last serum. His eyes wide opened and he roars as the humanity in his heart has finally lost and is now free like wild animal.
Weeks after the incident, the 1A have finally closed the experiments and made sure that the serums are no longer available, though UA had to declare that Mineta is considered dead. In the same undiscovered forest, a feral boy, devoid of humanity, is running around to find water to quench its thirst. It finds a pond but there's also a feral girl drinking the water. It has the same characteristic as the feral boy (maybe it is also a victim to the experimental serum?) and so the feral boy tries its best to remember who it is but to no avail, so they approach each other to greet. The End.
I can make a fanfic out of this, but this needs some tweaking and grammar correction. The feral girl was supposed to be Mineta's old friend from middle school but i didn't have the time to fully write a scene of the two meeting in the experiment and buying the serums together, and also i don't know how to make more angst between Mineta and Kaminari, Tsuyu and Shoji. They tolerate Mineta the most in original MHA. This may or may not be an original prompt so please leave criticism in the comment, thank you.