Wow, the great use of grammar, and orderly structure of escalated events made this a very realistic; and arousing story. Honestly, I can't really see a part 2 to this, but every writer thinks of something. I say go for it. I liked the animalistic behavior with it from both of them. Although, I got one move you could try in this sex stuff.
Try stuff with more flexible positions. I know everyone is different, but it could be worth a try. Considering she is a Lucario, fighting type, and a female? She should most Definetly be able to stretch in ways without it hurting her, and most likely arouse Dellas even further. (or maybe the audience and score some better smut points.)
For example, Dellas could push her on a wall with her back towards his, and pulls one of her legs up-full length behind her head. And pounds her Woman-area like that. You get the image?

Or, she could be on top of him, with him laying on the bed, riding him in the monkey pose, or it could be seen as a split. (hanumanasana, yes these are yoga pose names.) Now keep in my, these are MY kinks, I'm not telling you TO try them, on saying it could possibly be hotter. Funny how you can turn really anything into a Fetish, kink ECT...

I think that you’re off to a good start if you plan on continuing this story.

This is great