<H cup Chinatsu Niiyama> is my girlfriend.We've been dating for a while now and are in love, so today is our long-awaited date at home.We plan to have lots of flirting and lots of sex! ...Then suddenly came <G cup Yuri Aise>...my younger sister.She seems to have become suspicious of the fact that she hasn't been coming back to her parents' house much lately, so she came rushing in without making an appointment.Moreover, this younger sister has a severe bra complex.When my girlfriend's younger sister saw me flirting with her right in front of her, there was no way I could leave her alone...Big tits battle starts from here!Chinatsu, who has an overwhelming position as a girlfriend, and Yuuri, who uses her promise to marry him as a weapon, approaches me with delusional old stories.Breast fondling, titty fuck, and in the end, a pincer SEX showdown and an increasingly radical battle!Grab your cock and head to the front line!