Snake Skin and Viper's Venom

One day, Karasuma brought an experimental drug into class, which his Superiors wanted him to test on a willing student.

Nagisa agrees to be the test subject, but other than knocking him out, the drug had no effect. In fact, he was completely fine until he got home, where the delayed affects hit him full force.

His strength and speed are increased by 100%, if only for a few minutes, but that's not the only affect. What if the main ingredient was the venom of a rare snake species? And what if Nagisa became extremely addicted to said drug?

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All the characters are from Assassination Classroom, which belongs to Yūsei Matsui. Nothing but this stories plot belongs to me.
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Triggers
-Drug abuse
-Abuse