Overprotective and sexy older sister worries about her little brother, gently washing his cock for him. Her hands are tender, softly stroking the tip, noticing the tingling sensitivity of his glans—making it impossible to hold back. The younger brother had been studying hard, but his sister keeps a close eye on him, deciding to help by teaching him affectionately. Since he's never been good at studying, she ends up worrying too much. Eventually, she decides to wash his body for the first time in a while. Recalling how she's always bathed him since childhood, she starts carefully with his upper body, gradually moving downward. The embarrassed brother turns around, but his sister gently washes his buttocks. When her breasts brush against him, he panics and tries to hide his cock. Noticing this, his sister softly asks, "Hey, has it gotten big?" The brother replies, "I got excited seeing your body." The sister responds, "Let's clean it nicely," "Do you always pull it back and wash properly?" "Let's scrub it well," "Bacteria builds up here, you know," explaining as she pulls back the foreskin and carefully washes the glans. After rinsing off the soap, she gently reminds him, "Stuff collects here. If you don't clean it, it's bad for your health." Then she proceeds to pamper him with various acts—handjobs, fellatio, no-hands blowjob, deep throat, ball licking. Rubbing her nipples against him, she moves into a titfuck, teasing, "Do you want to release what's built up here and feel refreshed?" The brother answers, "I'm gonna cum," "Let me cum." He cums from a handjob all over her chest, and the sister says, "Let's move to the bedroom. Let's do more grown-up things." They share tender, erotic moments—kissing, nipple sucking, fellatio, breast licking, cunnilingus. The sister moans, "That spot feels amazing," and cums. Then she gently teaches him how to touch her pussy. "Play with my clit," "You can touch me more right there," "Keep going, keep going... I'm cumming!" she urges, guiding his fingers inside. "So full," "Nooo, there... it feels too good!" she cries as she cums again. Then the brother says, "Onee-chan, I want to insert myself..." First, missionary position penetration. "It's okay," "Does it hurt?" "No, you're good," "You can thrust as much as you want," "You're doing great," "Hitting deep inside every time," "It's getting bigger and bigger," "It feels so good," "Ah, no, I'm cumming... I'm cumming!"—he cums repeatedly. The sister teases, "Should I do more for you?" and mounts him in cowgirl position. "Let's feel even better," "Can you still hold on?" "Ah! I'm cumming again!" she screams in climax. Switching to reverse cowgirl, she says, "Since you held back, I'll give you even more." Clearly loving this position, she cums over and over. "I feel like I'm gonna cum, Onee-chan," the brother says. "Nope, not yet. I'll teach you even more," she replies. Penetrating from behind, "This really goes deep," "Too deep—!" she cries, but still praises, "You did so well," then coaxes, "I'll do it for you again, so lie down." Back in cowgirl, she asks, "Have you ever had a girl ride you like this?" "This is my first time," the inexperienced brother admits. "Just hold on a little longer," she gently encourages. He's about to cum. "Not yet!" she stops him right before. Intense piston thrusting brings him close again—stopped once more. Grinding, the sister cums. Transitioning from seated kissing to missionary, she kindly checks, "Move however you like," "Does it feel good?" "I'm gonna cum again," "Ah, no, no!" she cries out, climaxing repeatedly—this is her 10th orgasm! "You're showing your limit," she says, "Go ahead, thrust as hard as you want," "You can cum wherever you like inside me," inviting creampie. She kisses him, whispering, "This stays secret between us and Mom and Dad." She remains a tender, erotic older sister until the very end.