Lovecubus! ~Onna no Ko Akuma ♀♂ Otoko no Ko Akuma~

The Protagonist Tarou has a correspondent who is an English girl. One day, his correspondent Elena's family moves to Japan and they meet for the first time. With an awful start to their meeting, a dislike for each other emerges. Tarou is handed a handwritten book from Elena, and as he flips through the pages he recalls memories of his previous life. In reality, Tarou is a wizard who has repeatedly reincarnated for the purpose of studying sexual magic. With the memories of his previous life back, he casts a spell to summon the lecherous demon siblings, Leene and Ruuna who live in the demon world. In Tarou's previous life he had also summoned the demon siblings and subjected them to the tantric mysteries of India and Taoist sexual practices. Then one day, Elena witnesses the three of them having sex and at that moment she regains memories of her past life. Also a sorceress she was defeated and humiliated by Tarou in her most recent previous life. With revenge in her heart, Elena plans to use her sexual magic to trick Tarou. On the other hand, the lecherous siblings are looking for an opportunity to escape Tarou. A feast of sexual magic and with the danger of catastrophe, things are about to get more and more perverse. [Translated from the game's Official Homepage.]