We're a couple, but we're really different.
There's the height difference, and our personalities are totally different.
Moreover, my boyfriend treats me like a cock sleeve for his sexual gratification and fucks me without any consideration.

After today's sex, he began playing his video games as usual.
I get off from being ignored by him, but at the same time, I'm worried that he's actually not satisfied with me in bed at all...

While calling out to him, my hand accidentally touched his nipple.
Then, he let out a short moan and looked upset.
Huh...? What was that voice just now...?

I'm always on the receiving end, so I've never thought about it, but...
Perhaps, Tetsu-kun also wants to be teased...?

Thus, the masochist me decided to develop my sadistic boyfriend's nipples...

Official Translations:
English, S.Chinese, T.Chinese, Korean