Riina Aizawa stars in a tickling and nipple teasing erotic session! This H-cup beauty wears a school swimsuit as she meticulously teases a male masochist, skillfully targeting his armpits, sides, and neck with adorable precision. As the sensations build, her pleasure becomes evident through her changing expressions. Soon, the tables turn as the man launches his counterattack, flipping the power dynamic. He relentlessly tickles her armpits, waist, and inner thighs, drawing out genuine reactions—squirming, laughter, and overwhelming sensitivity. She confesses that her large breasts' nipples are her most vulnerable spot, making them a prime target in this intense tickling battle.