Baku Ane Otouto Shibocchau zo! 2

Due to the trauma he suffered in the past, Takesaka Munetaka fails the first time he tries to have sex with his lover. Ritsuka's sister and Momotani Mashiro's cousin risked their lives to teach him sex lessons and aid in his healing. When Wakana, the sibling who caused him so much pain, gets involved, it becomes more than simply a lesson! The sisters' struggle for their young brother has begun!