From today, I'm your master! I'm lending my sister Hikari 300,000 yen. If she defaults on repayment, I'll do whatever I say. As promised, she'll do whatever I say (lol). I've turned my sister, who always looks down on me, a maid otaku and creepy nerd, into an obedient maid! I can do whatever I want with her bouncy F-cup breasts! Anywhere! Anytime! I'll massage them! I'll lick them! And I'll fuck them! She'll grumble, but with a scornful look on her face, she serves my dick with her breasts!