Hi
Pr0GamerJohnny !
Here are some summaries for the InsanErotica/Cpt.Kitty/etc. Dev group(?) games for your listing.
Generally said, you have romance, sharing, cuck and hard NTR paths in these games. You can mix and match, e.g. one girl romance, another sharing, next NTR in the same playthrough, but that is difficult without a walkthrough, since not all major decisions are easy to recognise and sometimes even counter-intuitive in their choices. In addition, even the official WTs do not show all path options, so you can find some variants on your own.
Among the cast, there is always at least one true a... antagonist, often more, but sometimes you can become somewhat "buddies" later in the game. Also the love interest personalities vary quite much, from really nice to repugnant.
My future Wife 1-4
You start as a last year high schooler with a special gift. You can sometimes look a couple minutes into the future (later through mentioned training several hours, at times years). Your possible love interests are your class comrades Ha-Young, Hui-Bing and Elly. Ha-Young is the designated main girl, but you can also have relationships with solo and/or group endings with Hui-Bing and Elly. The four games follow them from High school to their late twenties. Has scifi elements in 3 and 4.
New Earth 1-2
Plays in the future where a spaceship crash-lands on a planet after a wormhole accident and the crew of 8 persons has to colonise it. The player is the captain of the ship, your girlfriend is with you and the main antagonist is the first officer Justin. Also in the mix is the very mischievious (and having own plans) ship KI Eun-Jun. You learn later on that the accident was not one and that the crew are all clones in an experiment. This game plays in the same universe as "My future wife". A warning, depending on your choices, there can be a path with torture scenes.
The Engagement/Jealousy
The first game is about a business man living with his fiance Emily, who gets a new work colleague, an asian woman named Suzy Lee. While the game gives some reasons for Emily´s personality, she is an overly jealous piece of work. For example, in one playthrough, she cheated on the MC out of unfounded jealousy, while you saved Suzy Lee from an asshole trying to blackmail her, signing an important contract only if she has sex with him. There is a reason even very loyal players start to turn to Suzy for a relationship over the run of the game.
The second game starts from the threesome end of the first and in my opinion the standout feature here is that most characters, on some paths including the MC, are people you do not need to know. Suzy, her sister and Amy (sometimes the MC too) are the only likeable characters in the game. And it is a pity that you cannot get an ending with them alone, you need the harem ending for that.
More these days