Succumbing to Pleasure

Succumbing to Pleasure is a bad ending and one of 25 possible fourth episodes in Shiny Days.

Plot
The plot is identical to Like Mother, Like Daughter up to the point when Makoto finishes his sex with Sekai.

After Makoto finishes his sex with Sekai, he falls asleep. When he wakes up, he finds himself tied up in Kiyouras' apartment, and facing a Setsuna with sexy underwears. He asks Setsuna why he is tied up, Setsuna replies that this is punishment for him. He tries to deny but Setsuna reveals his relationship with Youko and Sekai.

Then Mai appears and blames Makoto for being faithless to Youko and Setsuna. However, Setsuna says this is okay and she still loves Makoto. That she wishes to try some serious sexual activities on him, in order not to lose to the Saionjis. Makoto tries to discuss but Setsuna suggests they discuss by sex. She then says this will be "painful at the beginning, but finally leads to extreme pleasure" and proceed by saying " Mako-chan, I love you".

The game ends with an extreme scream from Makoto, indicating the process is really painful.

In this ending Setsuna reveals her secret love of sadomasochism at sex.

Route
To get Succumbing to Pleasure, the following criteria shall be met.
 * Makoto shall seduce Youko before he starts dating with Setsuna, otherwise you'll get Setsuna Disappears instead.
 * By the time Setsuna leaves for Paris, the bar shall be low enough, otherwise you'll get Together instead.
 * Makoto must not answer "yes" when questioned by Mai about whether he is Sekai's boyfriend or not, otherwise you'll get either Knockout Kick, With My Family or Interception instead.
 * By the time Makoto has sex with Sekai, the bar shall be high enough to get Succumbing to Pleasure, if the bar is low enough you'll get Like Mother, Like Daughter instead.

Trivia
Setsuna's punishment seems a reprisal for what Makoto has done on her in the waiting room of Radish.

This ending can be seen as an allusion to Midori Nagawa's Queen Ending from Pure Mail in which she also dons a dominatrix costume and uses a whip to torture Kei Ogata.