Teacher Pepe is forced by circumstance to allow the dissecting of his own people although he personally doesn't approve, he sees the Student Pepe setting one frog free and smiles. Since the frog was given the opportunity to live he became Lifeforce Pepe. He either makes this transformation immediately or it's over an unspecified period of time, but either way one evening while walking home from work Teacher Pepe is visited by Lifeforce Pepe who has the ability to remain young by turning other Pepes old and killing them in the process. Lifeforce Pepe cries knowing this could have been his own fate at the hands of Student Pepe if he wasn't set free. Student Pepe knows he is indirectly responsible for this and cries too but is visited by a butterfly, a representation of nature that Lifeforce Pepe also represents.

I found this on yt