Milk Junkies 2 by Blue Gale ON DEMAND - Adult Sex Game

The main character, Sakurai Wataru, lives at home together with his father.
However, by coincidence, the father is transferred to a new place abroad. Amazingly beautiful sisters are moving into the neighboring apartment at this time. Wataru, who was previously familiar with them, sees their faces and remembers their names. ... Fusano Fumie and Fusano Tomoka. As an elementary school student, when his mother was not there, they were his friends, at the time replacing his mother. Since that time, neighbor Fumie has grown huge breasts, 100 cm of super huge breasts. Since those days, Tomoki has poured plump breasts, beautiful, big breasts of an adult. To make matters worse, Fumie is Wataru's school teacher, and Tomoka states that he wants to become Wataru's home tutor.

The cheerful life of a third-year student began. At school, contacts with Fumie. In the classroom, Fumie puffs out her breasts profusely while teaching English. Returning home, Tomoka comes to teach English. Bursting breasts at lunchtime, huge breasts in the evening. There is no hope that this problem will resolve itself. After that, both develop strong affection. Sexual instincts begin to wake up in girls. Since those days, Fumie-san has become more affectionate. Tomoka-san is getting kind too.

During the English lesson, while walking around the classroom, Fumie uses the opportunity to accidentally snuggle her breasts. While teaching math, a deep crevice opens between her breasts and Tomoka smiles softly.
"...Concern about something?"