Momiji in heat.
You come home and see that she's humping your furniture, and has completely lost her composure due to her desire to mate. She's all flustered that you saw her rubbing her dripping wet crotch against the couch, and you ask her what's wrong. Momiji is panting and out of breath and moans quietly as she starts to hump your leg, and in short order she's absolutely begging you to fuck her silly. Heat has absolutely driven her out of her mind, and she wants sex more than anything.
You then pick her up and she playfully nips at your ear and makes aroused-sounding growling noises as you carry her over to your bed...