Ava began to feel uncomfortable on her back and rolled over onto her stomach. What Ava hadn't realized was that she was near the edge of the bed. Instead of rolling over she rolled off! Ava was briefly scared before landing on all fours. It took her a moment to realize what happened, but when she did her hands immediately went to her ears. She wasn't surprised to find she had pointed ears, with the tips poking out of her hair. Feeling her backside she found out why laying on her back was uncomfortable: she had a long slender tail. Standing up, Ava found she could balance easily on the balls of her feet. She walked over to a mirror and the reflection confirmed her findings, along with showing her pupil's had changed to be like a cat's eyes. She didn't seem have any fur or extra hair though, at least not yet.
She remembered now: February meant Valentine's Day and she figured a sexy catgirl would be a perfect present. Ava turned back to the bed where Ethan was still dozing. She walked back to the bed then, sneaky as the feline she was transforming into, climbed back into bed without waking him. Ava nuzzled up to her boyfriend like a cat, nudging him away.
"Hey..." was all me managed before noticing Ava's eyes and ears.
"You're a cat this month?" he asked.
Ava nodded eagerly. Ethan reached out and touched one of her ears, rubbing in gently with his fingers. Ava's tail immediately shot up with delight. Seeing the response, Ethan began rubbing her other ear with his other hand. Ava was blown away at how much of an erogenous zone her ears were and began purring uncontrollably mixed in with the occasional shudder of pleasure.