A sudden phone call in the middle of the night. "I missed the last train, can I go now?" Although he knew it was a bit strange for his girlfriend's younger sister, Miyu, to ask him to stay over, he reluctantly insisted.<br /> She comes home, takes a bath, and relaxes on the sofa. My eyes were drawn to her ample cleavage, peeking out from under her loungewear, and I asked, "Are you looking at my breasts? Perhaps... you're excited?" Eh, was she showing it on purpose? It doesn't seem like she's inviting me, but it's clear that she's open to having sex. Furthermore, she mischievously brought her soft lips closer to me as if inviting me to a kiss, and my reason collapsed!! "You won't tell your sister?" Today I'm going to mess up my girlfriend's cute, devilish, and easy-going sister!!