My little sister is way too cute in her swimsuit... As her big brother, I'm worried that bad bugs might swarm her.

Geez, you’re making too big a deal out of this, bro.

If you're that worried, then...

When we're at the beach, we just have to link our arms like this...

People are gonna think that we're a couple, and that's a good enough countermeasure, don't you think?