Sex Shinai to Moto ni Modorenaishi Soto ni mo Derarenai Heya

Tsubaki and Kajiro have been trapped inside a mysterious room that will only free them if they have sex. They've grown ears and tails, and though Kajiro is not too upset about the situation, they're both feeling something from these animal ears... (Source: DLsite) Note: Released at J.GARDEN 52.