Ayane : The Pregnancy Planet

Planet Lust is a story-driven sci-fi eroge game with tight gameplay, mild horror, with action RPG and farming sim elements.
 
The player takes on the role of the game's protagonist, "Swan", who, due to unfortunate events, ends up at a military base on Mars with four beautiful women. You'll have lots of time to spend there. Better make the most of it!

An urgent request for help has arrived from the city of Acmeya, which is on the brink of crisis due to a massive outbreak of monsters! As an experienced hunter, you (the protagonist) set out to save the city by hunting them down. However, the special amulet in your possession turns out to be made of “Acme Crystal”—a mysterious ore that overflows with power whenever you make a girl reach her peak climax…?!

This work is a spin-off of “The Debt-Ridden Witch’s Adventure Without AV”.
It’s a story that recounts the gruesome and depraved fate that a certain character from the previous work became entangled in.
Amidst days of brutal abuse that cannot be broken or corrupted, the mind and body undergo transformation.

The protagonist, who is dating a wealthy young lady, visits her mansion under the pretext of studying together.
He manages to bring the mood right to the brink of intimacy, but is ultimately interrupted by her maid.
Calling the protagonist out, the maid reveals that she has resolved to offer up her own body in order to protect the young lady.
“Embrace me instead of the young lady!”

Alfhelm is a world of elves where only females exist.
With their Holy Tree withering away, the elves faced the threat of extinction. Guided by divine revelation, they summoned a savior from another world - the protagonist.
Even while the elves and the dark elves were at war, the protagonist continued having babymaking sex with everyone. But Evelyn, feeling uncertainty about their babymaking activities, turned to the elder Nol for advice.
In response, Nol deviced a brilliant plan to make it an utter certainty that the two continued making love. Her plan was to lock the two into a "babymaking room" that they were forbidden to leave until she got pregnant.
Misery, who overheard the plan by coincidence, immediately joined in. With Evelyn wanting to serve her master, and Misery getting excited by the competition itself, the curtain rises on a circumstance where intense babymaking is mandatory.