Your friend Wiktoria is doing a durability test on her very squishy rear where she sets two pistons between her giant rear and it presses on them. When the pistons do so, she made her butt grow to see how far she can push those pistons instead of letting those pistons push her butt.

Wiktoria: HA! These pistons think they can overpower this tush! Well these pistons stood no chance!