If all else fails, Yuyuko could just eat the safe.
Lol... Surely you're exaggerating lol.If I don't do this, it'll be eaten by Yuyuko-sama...See?Eh... wait... why did you put it inside a safe?You gotta be kidding.To be honest, even this is taking things on the lax side, okay?I doubt she'll be able to eat it with that much security lolI made a cake for you, Reisen-san. Let's eat it together.