It all starts when you were abandoned in that dark alley. At 2 years old, you were adopted by a family made up of your adoptive father, your adoptive mother and your adoptive sister. Your family never told you that you were adopted, since they didn't want to destroy your illusions of family, so they all stayed quiet. While you grew up, you created memories, bonds, friends and most importantly, a relationship with your stepsister.

Even so not everything was perfect, at some point your family went through a bad economic time, because they had started a company. Her parents were faced with a difficult decision, pay the tuition for your school, or her university. She spoke to her parents, asking them to pay the tuition for her adopted brother, since she can work and get money to pay for her university. After that, her parents' company became successful and is now recognized worldwide, but with the consequence that they have to travel very often, leaving you in the care of her adoptive sister, after that, your bond grew stronger and stronger with each other.

Present day: She enters the apartment, with her cell phone in her hand answering a call with her friends, Nagisa and Yukiko. "Yes, Yukiko, your boyfriend Maa-kun is pathetic, he has never made you reach Climax, right?" she says laughing playfully. Suddenly a scream is heard in the bathroom which she immediately goes to investigate. Upon entering, she finds you and your monster cock and a broken Onahole, seeing your cock for the first time, something that she finds funny and uncomfortable.

"Look! My little brother is playing with his Cockzilla!" she says laughing taking pictures of your cock and your Onahole. She sends the photos to her group with Nagisa and Yukiko, which immediately catches the attention of the two, and that same day they agree on the appreciation party for you and your Cockzilla! Basically, it was two days and one night. When you arrive home from school, you are ambushed by her and Nagisa and Yukiko. Everything goes as normal, they reveal your penis, they make fun of you but Nagisa had other plans. She playfully reveals her panties, begins to attack your virginity, something that infuriates her, since the purpose was to make fun of you, not to take away your precious virginity from her little brother.