love that bitch like she's never been loveed before!
Well, she probably hasn't been loveed before, but whatever.
You decide that you'll probably remember this for later to boost your spirits, seeing as even if you fail horribly at loveing her it will still be the best love she has ever experienced. And you can be proud of that, right?
Generate genes to produce flagelli and an eating hole. (primitive paramecium). Duplicate genes and inject into female Chell.
You write genes for a flagella and mouth. You had to get rid of your "arm" in order to have enough body mass for the flagella. You don't think this matters though. You also make copies for the female Chell. She seems to accept these genes and change rather quickly. You assume this has something to deal with the genes you copied for her earlier.

Whoever made you isn't a great artist, but they seem to function well despite their appearance.
You also don't know what the fourth wall is.
You try to communicate with her again, to ask about loveing her.
She does not respond in the way you communicate, although she does respond physically, by wagging her tail. I mean flagella.
You love her. Since you're not sure what loveing actually is and whether the genes you made for it work right, you don't know if you did it right. But she wagged her flagella more, so you assume she liked it. That or she was trying to get away.