Anonymous1: There growing because, well its really simple. He's getting hard, which means his dick is getting bigger but what makes him grow is the humor of him getting bigger.
Anonymous12: basically they were regular kids UNTIL! they started turning into Porkyman started having sex and stuff and growing YAY FOR EXPLANATION ^-^
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riolu evolves when he gets happy.
he's being given head, therefore he is happy, so he evolved mid blowjob.
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Oh god, I can't believe I didn't thank of that before. Makes it all the more fappable.
Just seems like the other Riolu would've evolved too... from my point of view.
Learn how to fucking read
where's my ipod?