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

Halo is a talented female elf magician who has memories of when she was a man in her previous life, which is why she wishes to make out with a cute girl. Halo decides to buy Filia, a beautiful female slave with big breasts, but things don't go as she expects them to..