Her little sister Rin-chan stayed at our place for five days. I couldn't help but peek and see her naked, and I lost control. I snuck into Rin-chan's room while she was sleeping! Taking advantage of her weak-willed nature, I licked her pussy, and then she started licking my cock from the base… She was surprisingly aggressive! Seizing the opportunity when she went to work, we had sex multiple times, but…
