[ROYD-306]

"You have to wash it properly!" My much older sister who still treats me like a kid tries to peel back the foreskin of my uncircumcised dick and gently wash it thoroughly. Meisa Kawakita

The protagonist has a beautiful older sister who is quite a bit older than him. She's very attentive and still treats him like a kid even though he's now a high school student. She meddles in his studies, his private life, and even how he takes a bath. One day, as soon as she sees his uncircumcised dick, she says, "You have to wash it properly! No girl will like you!" and tries to pull back his foreskin and wash it. Despite her being such a beauty, being touched like that makes his dick gradually harden, turning into an adult erection. Seeing this, his older sister is initially surprised, but soon gets excited and starts moving her hand. It feels so good that he cums on his sister. Thinking this is bad, but his older sister, turned on by his grown dick and the cum he shot, makes a super erotic face she's never shown before and says, "Hey... let's do something more adult."