The most boring and least cost-effective thing in the world has to be taking your little sister out for fun, especially when you're taking two at once. It's the hard work of a babysitter with the toil of a father, not to mention spending money and time, and the key point is, you can't even get any advantage out of it. This is simply a guaranteed loss with no profit.
In fact, if it were just Rongrong, it would be fine. She is a typical little sister type, and her "strangers keep out" policy wouldn't cause anything too unreasonable. But it's different with Xiaomao; she is exceptionally clingy, and some of her actions can be described as typical over-the-top behavior. What's more, she just doesn't listen, no matter what. Even though she might agree verbally, she reverts to her old ways the moment your back is turned. Just a bit of a harsher tone, and she'd stare at you with watery, wide-open eyes, her face a picture of grievance that is unbearable for anyone.
