Professor's Great Invention!

Mad scientist + shark teeth + over eye bangs + uncontrollable horniness... PLEASE PUT A BABY IN HER ASAP!!!

Lil’Bro got a big dick thanks to his Mad Scientist Onee-san who wants to immediately bang him if he isn’t a Lucky Bastard I don’t want what he is!

Final panel: absolute comedic perfection.

If she legit made a medicine that made your dick bigger, she would instantly become the richest person on earth.

In the words spoken years ago by a certain boy genius: "Today Was A Fine Day For SCIENCE."

And even if this Sexy Onee-san Mad Scientist's motives for sexy time were purely for testing purposes of her formula, a part of me will still conclude:

"It's GOOD To Be The Assistant." (Amase-kun, you Lucky Bastard).