教育に煩い義母と優等生な義姉に種付けも勉強の一つと催眠をかけた結果（Kyouiku ni Urusai Gibo to Yuutousei na Gishi ni Tanezuke mo Benkyou no Hitotsu to Saimin o Kaketa Kekka）

An adventure game about a boy who uses hypnosis to "educate" his loud stepmom and honor student stepsister about creampies, impregnation and dick supremacy.

[From DLsite English]