SONE-640 _Dated his best friend but was attracted to her sister

My best friend with big breasts makes me so infatuated that I can't stop?! Aika and Takashi have been close friends since they were swimming naked in the rain. Yet when she grew up and reached the age of getting married and having children, Aika was still lonely even though she had a pair of breasts that many boys craved. Because you...? Takashi, on the other hand, is handsome and big enough to attract... Aika's younger sister. When she found out, Aika planned to seduce and steal her sister's boyfriend. Facing the charm of one of the most beautiful breasts in S1 Studio, will Takashi be able to maintain his composure or will he fall into the trap of desire that Aika has set up? Please watch the entire movie to get the answer.