Joanna lay on her bed absentmindedly running her hands over her body when she noticed something strange: extra nipples. She got out of bed, still wearing the coat and looked in her mirror. Sure enough she had an extra pair of nipples below her breasts. Feeling them in the mirror she found them very sensitive. As she played with them she soon found she had growing mounds of titflesh to go with the nipples until she had two full pairs of breasts instead of just one. She fell back on her bed, fondling her extra breasts until she had another orgasm. She didn't give any thought to why this was happening and wasn't aware tigers had four nipples - unlike most cats which have six.
Still she craved more. She now had four breasts but only two hands, and the warmth in her crotch hinted at even greater needs.
Putting on shoes and taking her purse and keys, Joanna wrapped the coat snuggly around her. It had no fastener, but as long as she was careful nobody would know she was naked underneath. She paused to admire the tiger stripes in front of her mirror, then left her place and headed on foot to her boyfriend's apartment, looking to surprise him. She got a few strange looks along the way as it wasn't cold enough for such a coat, but Joanna didn't care. She loved the feeling of the coat against her skin.
She knocked on her boyfriend's door. A moment later he opened. She stepped inside and closed the door. They kissed, and the feeling of her body against his immediately caused him to realize something odd was going on. Then Joanna opened her coat and his eyes went wide.