Kakuu no Kyoukai -hallucination-

"Boundary of Fiction" is a game allowing you to become the main character with a special power. You can take your partner to the fantasy world, manipulate tentacles and attack the heroine.

Hero: Since you are a beginner, I guess …this is it. Looks like you really enjoyed it more than I thought you would.

Girl: No, I did NOT enjoy it. Don’t think I agreed to it, when you used such a nasty trick. I don’t like this at all.

OK. Then, I am going to make you enjoy it. All girls are the same. I can make you go crazy with pleasure.

[From DLsite English]