KTRA-230 If I show my dick to my sister while she's studying... Blue-colored ghost

I Want To Fuck My Serious And Honorable Sister Anyway! While the parents are away, the older brother plays a series of naughty pranks on the younger sister! "Onii-chan is really an idiot!" My younger sister, who is weak against pushing, listens to whatever he says! My older brother is very excited about my younger sister's body that has grown erotically! This and that, my cute sister's body fulfills my brother's desires!