Write the first part of an erotic horror novel, starring an anthropomorphic dog scientist genius, named Sapphie, and her involuntary assistant, a much more dim-witted and especially air-headed bunny named Ruby. The horror begins when Sapphie, curious and perplexed as to how human copulation works, creates and intentionally injects herself with an aphrodisiac, expecting only a mild reaction, but instead it drives her mad with lust and the need to breed, leading to her hunting Ruby down in an attempt to sate herself as she tries to desperately hold herself back, to no success.