SSIS-065 While my parents were away, I gave in to my sister's temptation and fucked her non-stop for four days

My stepsister 'Yura,' who is one year younger, has recently been enjoying teasing me with panty flashes. One day, when our parents were away for four days to finally take their honeymoon trip they had missed out on, Yura's cunning and adorable seductions escalated! 'You wanted to see my breasts, right!' In the space of just the two of us...my cute stepsister who isn't related by blood...I couldn't maintain my sanity any longer and we had forbidden sex! We indulged in sex until the very last moment before our parents were due to return——.