Alone with a wonderful older sister... I can't help but anticipate some naughty developments! But... somehow, the older sister seems uneasy. An experienced older sister should be making a boy who wants to be treated nicely ascend with her boastful techniques... but the older sister, who feels things when her body is touched, unintentionally gives a thick blowjob without intending to tease, is very suspicious. Maybe she's actually a true masochist, but for your sake, she's playing the role of the 'seductive older sister'!