Mesugaki Succubus No-Hands Blowjob Seduction Simulator

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.

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...

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.

Your younger sister, Tsukino Yuzuha, is an excellent student who excels in both academics and sports. Due to this stark contrast, you, an ordinary brother, have kept your distance from her. After the school's closing ceremony, you returned home and accidentally caught a glimpse of your sister in her underwear.

"You get excited by seeing your little sister in her underwear, Onii-chan?"

However, that honor student sister of yours... turns out to be a cheeky brat!

"Onii-chan, your summer vacation belongs to Yuzu."

Now, with this cheeky brat having leverage over you, and you being at her mercy... a sweet and naughty summer vacation between the two of you begins.

It’s a simple dungeon crawl style game, where you aim to recover from sexual harassment while aiming for the surface.
You progress by defeating monsters, earning money, honing your combat skills, and increasing your options for sexual harassment.