[Rico] Onii-chan no Sukumizu Model [Tenuous Scans]

A shy younger sister named Karin dreams of becoming a cute model, but her brother urges her to try something that will excite him, leading her to strip down in a school swimsuit and submit to his advances. The tension builds as she feels both strange and aroused, her soft thighs and sensitive breasts responding to his touch while she whispers his name in a mix of fear and desire. The intimate encounter escalates, leaving her breathless and questioning whether her innocent wishes can survive the forbidden bond with her older brother.