Maybe when... uh... if...

If there's the possiblity that your sister might end up, uh, pregnant... her fault, really.

Well, maybe make sure that she's not in one of her pony phases.

Because... uh.

Human + Pony = Well...

Sis:

Bro: Don't look at me like that.

I love that humanized Izzy. So cute!

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Be sure to wish your sister a Happy Mother's Day...

...after all, it's partially your fault.