HUNTA-664 "Big brother, are you avoiding me?" "Idiot, it's the opposite! (※Inner voice)" The little sister who innocently approaches me is...

My always innocent little sister, who I really like, is actually my perfect type as a woman, and it's troubling! Just to make sure she doesn't find out, I've been avoiding her, but then she thought I hated her and tried to close the gap by saying she'd wash my back and barged into the bath! The feeling of her developing breasts and skin rubbing against me made me hard, and when she thought I hated her for it, she got excited that I was hard because of her and invited me to play with her sensitive nipples. She came so hard, her body arched like a bow despite her face giving nothing away!