BBP A girl who fell into a big black penis

Saki is a student who has been sexually abused by the poisonous fangs of English teacher Shirai. Shirai pleads, "Please give me a second!" and places a condition in mind, "Bring your best friend, Lala, as your substitute!" Betrayed by her best friend, Lala is trained as a sex slave by Bob, a temporary English teacher who Shirai brings...