Returning home early in the morning, I found my cousin who'd been staying over since yesterday sleeping in my bed. Her butt was slightly sticking out from under the blanket, so I pulled the covers back to check her body—only to discover she was awake. She quickly tried to get up, but since I hadn't bathed the night before, I naturally headed to the bathroom. As I walked, I started picturing her body and couldn't help jerking off. Seeing this, my cousin curiously peeked over and said, "I sweated in my sleep—maybe I'll take a bath too," then began undressing. Watching her, my cock grew harder and thicker. My cousin, noticing my erect cock, stared with sparkling eyes. We got into the tub together, and when I realized she was glancing at my cock, I decided to wash her body. Her sensitive skin twitched and reacted, making it clear our desires were no longer childish. With the rest of the family asleep, we forgot we were relatives and gave in to our adult urges as man and woman. Though she acted shy and pretended to resist, her body clearly craved my cock. I deliberately brushed my hard cock against various parts of her body until, unable to hold back any longer, I shoved it into her mouth, making her squirm uncomfortably—yet erotically cute. "It's fine now—we're both adults," I whispered, turning her around so her ass faced me, then thrust my cock into her from behind. She moaned in an adorable, lewd voice, overwhelmed with pleasure. Showing her reflection in the mirror, I could see her blushing even as she surrendered to the sensation.