A sudden phone call in the middle of the night. "I missed the last train, is it okay if I come over now?" Even though I thought it was a bad idea to grant her sister 'Miyu's' request, I reluctantly let her stay over. She comes to my house, borrows the bathroom, and relaxes on the sofa. When my eyes involuntarily go to the plump cleavage peeking out from her loungewear, she says, "Aren't you looking at my breasts? Maybe... are you getting excited?" Eh, were you showing them on purpose? It doesn't seem like she's trying to seduce me, but it's clearly an atmosphere where we could have sex. My reason collapses when she playfully brings her soft-looking lips closer and tries to kiss me!! "You won't tell your sister, right?" Today, I'm going to mess up her mischievous, little devilish, and lively sister!!