i'm secretly dating my step-sister, keeping it a secret from my parents. of course, i'm just careful not to get caught by my parents on a daily basis, but on the days when my parents are away on a trip, i can't stop! my rationality, which i usually suppress, collapses, and i just keep fucking my step-sister over and over again! and the more i do it, the deeper my bond with my step-sister becomes! honestly, i'm scared of getting pregnant, but i just do it as a matter of course, even creampie. this feeling of having a lover under one roof is the happiest thing ever.