Saiinjutsushi ~Chijoku Mamire no Zecchou~

The main character lives a boring life, just going to school and coming back home. But one day, a strange girl appears and tells him, "I'll blow your boredom away." She gives him a pendant and a book about hypnotism. These items awake his secret ability, hypnotism.... Using this ability, he randomly has sex with his classmates, aunts, and cousins....

[From HimeyaShop]