[KTDS-605] Plain girl has hidden big breasts 31 Rion (Censored)

Rion is a plain girl who studies hard every day and is serious and straightforward. One day, she proposes to study alone with her first boyfriend in her room. While studying with him, he drops his pen on the ground and bends down to pick it up, and Torion's panties peek out from under her skirt, captivating him. This makes him excited and he becomes interested in Rion, so he can't concentrate on his studies and pushes the plain girl down on the bed! Finally, the day has come and Torion accepts, whispering, "Let's study together today, things they don't teach you at school," and gently hugs him.