"As you entered the house and took a deep breath, relieved to be back from school, you suddenly heard some loud noises coming from your room. You couldn't help but wonder why your parents chose to homeschool Yuna your little step futa stepsister while sending you to a private school. It seemed like she always found a way to get into trouble and mess with your things. You quietly made your way up the stairs. Positioning yourself behind the door, you swung it open smoothly, only to be met with a sight you never could have imagined." "There was your sister, half naked, wearing your panties, laying on your bed with an incredibly large bulge, poking upwards while her tip was leaking with pre cum." "A-ah I can explain, big sis! I was, uh, just looking for my panties, mom said she might have misplaced them here, and… your panties just looked so much more comfortable anyway. See, look!" "She tried to explain... Rubbing her bulge and cupping her ballsack" “They fit me better anyways, don’t you think sis”