Wow, this is one rude comment and backing up your boasting with those artworks?
I'm so amazed at how proud you are with yourself!
*full of sarcasm*
I'm not proud of myself. Only non-talented people feel like talent is a merit to be proud of. Whoever has a talent knows it's nothing you've done to be proud of, since you're born with it. But as little as pride comes with it, comes false humility: Saying you're good at drawing is the same as saying you're tall if you are, or big if you are.
That said, "with those artworks" doesn't say anything about the topic, which is anatomics...
People who can't draw bodies properly, shouldn't make erotic manga. The feet are horrible! And the story, if you can call it so, isn't very realistic either.
Even a male body upon whom sex is forced, isn't going to respond positively against the will of the boy. That is a physical impossibility. Fear causes stress and stress kills libido, even in a high school boy...
In short: this is a worthless manga. Sorry to say.