Eroi Koto Suru Tame ni Kyonyuu Bishoujo Dorei o Katta Hazu ga, Oshishou-sama to Shitawa Rete Omotta Toori ni Ikanaku Naru Hanashi

I Bought a Beautiful Female Slave With Big Breasts for the Sake of Doing Lewd Things With Her, but She Adores Me as Her Teacher and Things Don't Go the Way I Expected, えろいことするために巨乳美少女奴隷を買ったはずが、お師匠さまと慕われて思った通りにいかなくなる話