Bonyuu Kyoushi Jusei Ryoujoku

A married woman who is also a teacher is sucked in by one of her pupil's secrets, and ends up becoming his sex slave.
The days where which she used to enforce education soon transformed into a daily life in which she is submitted to training.

Her pupil becomes a real brute, and uses enlargement devices in order to subject her to a shameful body modification.
The married woman's mature and ripe body gradually develops into one of a perfect sex slave, due to the actions of her pupil, the brute...

Transform her into your own personal pregnant sex slave... Use her with your friends as a communal semen deposit...
It's all up to you, to finally enlarge her orifices, use her and degrade her to your own personal brutish liking!

[From DLsite English]