Okki na Saori-chan wa Bukiyou ni Eroi

Saori Otsuka, a quiet, honor student classmate, is a girl with a big body and big boobs.
Saori has one problem, it's been three months since she started going out with her boyfriend. Saori isn't very good at socializing. Even after many dates, she doesn't know how to close the distance.
According to Saori's research, a clumsy honor student, the average couple has sex about three months into their relationship, so she decides to ask her boyfriend out on a date at home.
Saori, who is an honor student, studied the video and the book, and practiced well on her own before going on sex, She'll wrap him up with her big body!
(Source: DL Site)