[IPZZ-850] My childhood friend Momo, worried about my NEET life, proposed a TTM game (lose if you get hard) to bet on my social return. Her lewd body and extreme seduction instantly made me fully erect and cum hard.

Did NOT understand the TTM on the cover – at first.

Looked at the cover. Saw

TTM

勃ったら負け

And on the back cover, saw that same thing separated on the letters

T勃っ

Tたら

M負け

A little googling explained

Tatsu 勃つ means a penis becoming hard

Terara てたら means if only…

Make 負け means loss

Suppose that’s TTM “lose if you get hard”

Then looked for a plot description. What I found was long, longer, longer still, and useless. But it ended with this

ポコタテ勃起勝負が始まった

Pokotate bokki shōbu ga hajimatta

Which Google Translate told me means:

The “Pokotate” erection showdown has begun.

ポコタテ being Pokotate. . . .

Now to try to understand that. . .