[Otonano Omochiya (Hirokawa)] Otonano Omochiya 19

A possessive older sister with a hair bun discovers her little brother has been fooling around with a girl named Kaede-chan, and her jealousy curdles into something far more dangerous—she's been waiting for her turn with him, and she's fed up. Pinning him down in his own bed, she coos threats against her rival before revealing her 'full erection mode' and taking him raw, sweetly promising to raise their child while he panics about getting her pregnant and what their father would do if he ever found out. Caught between her adoring smile and her murderous streak, the brother learns there is no escaping his sister's obsessive love.