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It’s been a while since I last read it but that sounds really similar to:
http://www.mangago.me/read-manga/sabi_no_yume/
But it’s a manga, not a manhwa; hope this helps though :)
YES THAT'S THE ONE!!!! My memory was super foggy, so I wasn't sure whether it was a webcomic style or manga. Thank you so so much!!!!
Np :) glad to have helped
At least I think it's a manhwa.. I read it a couple years back and forgot the name, but it's about this human boy turned cyborg with cat ears from a company. He sold his body to the company to save his sister from becoming their experiment, and lost his memory/previous motor skills to become a sex machine. He's a "prototype" and is being tested by the main character, a man, who works for the company. The MC doesn't approve of the sex doll usage of the boy, but is still in charge of him relearning language (specifically attempting to say things like "shove it in" "I love your dick" type of thing) and learning sex positions.
The boy doesn't show any growth in learning except for when he's with the MC. The boy shows attraction as well, saying stuff "(MC name I forgot)'s dick?". MC didn't show any reciprocation, but rather wanted to protect him, so he kidnapped him from the facility and brought him home.
That's all I remember, but I'm pretty sure that's really detailed. If that rings a bell for anyone, please let me know!!!