Everyone Pampers the Small Blessing Who Has a Spatial Pocket! - Chapter 718 - : Opening of the Nursery

Yo, Hi! I’m Frank, I made a deal with a demon to pay me some money for receiving a guest for a few days every week.
I had no idea about what I have done.
On May 1st, Conan ‘the God of Death’ came to my house. I was forced to let him in and we get involved in a criminal case.
On May 8th, Bruce Wayne ‘Batman’ came to me. I was forced to follow him to fight crime.
On May 16th, Hannibal Lecter, The Silence of the Lambs, came to my home. I can only say that I really can’t stand my guests.

- Description from Novelupdates

An incredibly athletic older brother, Tenryu Taiga. A programming genius girl, Tenryu Fuyuki. The two siblings separated for eight years ended up living under one roof again after facing the problem – a lack of funds for living expenses.

Fuyuki proposes a way to earn money, a core system deeply involved in people’s daily lives, a game that awards you money as a prize for defeating malicious bugs in cyber world, the 《Aries》structure. Taiga after becoming a warrior in the game relying on his inborn senses, is puzzled by the unfamiliar sensation.

One day Saionji Rui, Fuyuki’s best friend appears and is attacked by a mysterious bug― “I’ll be waiting, my prince.”. Hybrid fantasy battle of cheating siblings begins here!

(Women disguised as men) Strong women and men with black bellies.

‘He’ is a rare ‘male god’ who is handsome, wealthy and has no gossip. And he is an ordinary man who hits a wall when he gets along with a man and a woman.

A contract bound the two tightly together. Facing the indifferent ‘him’, he was always cautious, fearing that ‘he’ would fall in love with his prosperous appearance.

Isn’t the legendary ‘he’ aloof and unfeminine? It doesn’t matter, take the initiative to bring him. When the rare ‘male god’ identity is revealed, he not only has to face female love rivals, but also a large wave of male love rivals ahead. ‘What should I do if my daughter-in-law is too handsome? ’ ‘Being coquettish, being cute, and rolling around’

“Mother~Mother…” A certain neglected baby was hanging on his lap with an aggrieved expression on his face. As soon as the words came out, a chestnut fell on the baby’s head, “How many times have I said that I am your father and that is your mother?”

- Description from novelbuddy

Our protagonist Caam is a man from Earth that was reincarnated into this world as a demon. In order to survive, he spared no effort in avoiding the sparks of battle and without noticing it, he became strong himself.