IENFH-017 A high school girl who pitied my useless self promised to let me 'just rub' and do some cosplay sex, but we both got too into it. Her pussy was soaked! So I slipped in for real! "What?! It's inside?" But I couldn't stop and ended up cumming insi

"Hey! Mom said you should go take a bath!" the brother suddenly says as he bursts into his sister's room. The sister is startled and hides, saying, "I got it, don't come in without knocking!" She chases him out and resumes masturbating. The brother says through the door, "No choice, stop masturbating and go take a bath already." "How do you know I'm masturbating?" "Because we're siblings, that's how I can tell from the sound!" After the brother leaves, the sister continues to masturbate. She orgasms. A while later, the brother comes to check on her and finds his sister exhausted and asleep after orgasm. Seeing this, he quietly gets aroused and can't help but take out his penis and start jerking off. The sister wakes up to see her brother's erect penis being jerked off right in front of her! The sister flips out, "Masturbating using me as material? Unbelievable!" But when she sees him apologizing and sulking as he tries to leave, she stops him. "You were going to use me as material for masturbation in your room anyway, weren't you?" "H-how did you know?" "Because we're siblings, that's how I can tell. If you're going to use me as material, then help you out and finish here. But promise this is the last time." "Understood." So the brother jerks off while the sister shows her panties as material...