I Want to Be Milked by the Seduction Club Members

The protagonist, the hero of the Fire Dragon, embarks on a journey to defeat the Demon King with his childhood sweetheart, Fine, and his best friend, Gard.
A succubus tempts them in various ways,
leading to betrayal, infidelity, the collapse of friendships, and the protagonist's own army's downfall.
The story depicts everything from the setup leading up to the temptation to the consequences after succumbing to it.

Support the shy and reserved Sasara and help her become a full-fledged erotic doujin artist.
Unlock Sasara's skills by talking to her and bringing her gifts.
Every action increases the protagonist's sexual desire.
If his sexual desire level rises too much, he'll be unable to do anything until he ejaculates, so take measures such as masturbating regularly.
Making a wrong choice along the way won't result in a game over.
Enjoy your doujin activities with Sasara to your heart's content.
And every time you complete a doujinshi, your favorability rating will increase, triggering a date event!

Burned out from studying, a man checks into a hospital in search of rest. But this place is far from ordinary. What begins as a quiet stay soon slips into something surreal - -where the line between reality and nightmare starts to blur.

With every passing night, doubts grow. You must question what's real and slowly uncover the hidden truth buried within these halls. Only by surviving all five nights of despair will the full picture come into view.
 
During the day, you’ll explore the hospital, meet eccentric patients and staff, and progress through various quests. Through conversations and events, you'll uncover fragments of the story and gather crucial clues.

But when night falls, everything changes. Those familiar faces transform into terrifying creatures. You’ll have to hide, run, and make clever use of limited items and your surroundings if you hope to survive until morning.

The protagonist has been going through school life with his childhood friend, Akari.
He’s now a second-year student at Yuunagi Academy…
In schools these days, you get “points” based on your test scores!
You can buy anything with points, and they can even replace part-time jobs!
While there are still things that need improvement, the protagonist was living a very peaceful student life.
But one day, the academy is suddenly taken over by a certain organization!
It seems this school has been chosen as the site for their experiment…
With just one rule added, the power dynamics between boys and girls change drastically!
You can steal points just by making your partner climax!?
Will the protagonist be able to graduate safely!?

The other world is on the verge of ruin, and there's only one way to save it... the princess needs an heir. There's just one problem -- there are no men to give it to her! That's where I come in, whether I like it or now. I've been summoned to this world to save it from a horrible fate...