My big sister gently and carefully washes me in the bath, completely unfazed while I grow increasingly flustered. "We used to bathe together all the time when you were little," she says, casually ignoring my surprise, meticulously cleaning every part of my cock—from the tip to the very base. Overcome by her warmth and tenderness, I involuntarily get a full erection. "It tickles, onee-chan..." I say, but she keeps softly stroking the head, sending shivers through my sensitive glans that feel absolutely incredible. "Aw, your little cock got all excited... can't be helped, huh?" she giggles playfully, then proceeds to jerk me off, give me a blowjob, suck my balls, perform a no-hands blowjob, and deepthroat me—repeatedly making me cum with all sorts of naughty acts. She even cleans deep inside my balls, leaving me deeply moved. "This stays between us, okay? Not a word to Mom and Dad," she whispers, as I shoot my load all over her big G-cup tits in the bath. I erupt uncontrollably, cumming half inside and half outside. Finally, we face each other in cowgirl position, coming together sweetly. Three intense orgasms in total!!! This incredibly kind and loving big sister, with her voluptuous G-cup body, has completely captivated my heart.