The Sister in Law is an adult 3DCG animated kinetic novel made with Ren'Py by Tripod. You play as a male protagonist whose wife has two sisters, ages 24 and 19, who often visit and stay overnight or through weekends. One sister is a blonde described as gullible and easy to have fun with, while the other is a wild child who is harder to read. The story is presented as fact-based, covering a period of 10 to 15 years, with names changed and events condensed. For now, the game offers only two choices, and they do not affect the story.
The current build is v0.05, released on November 1, 2023, and development is ongoing. It runs on Windows, Linux, and Mac, uses English, and is uncensored. The latest update is a short release that adds fun dialogue and advances the story. The game also includes animated scenes, and the tags suggest themes of cheating, corruption, and humor.
Developer's description
Your wife has two lovely sisters. One is 24 years old, and the other is 19 years old. They both are always coming to visit and usually stay the night or for the weekend. This is more than all right with you because they are fun to have around. Not to mention excellent eye candy. One is a typical blonde and a total airhead. She is also gullible and easy to have fun with. The other is a Wild Child. That one is hard to figure out most of the time. This story is fact-based and takes place over a 10 to 15-year period. Condensing it down to fit into a short story is challenging, and getting the events in proper order is even more so. Of course, the Names have been changed to protect the not-so-innocent.
There are only a two choices for the moment that has no effect on the story for now.
v0.05
This is a short update containing fun dialogue and story advancement.
v04.09a
This update containes 15+ combined animations along with story advancment.
v04.09
This update contains 10 or 12 animations along with story advancement.
V04.08b
A short update containing story advancement, and a few humorous moments.
v04.08a
This update contains story advancement of course, and animations. There is a daring rescue of a damsile in distress
. Which turns out to be somewhat humorous.
V 0.04.08
The animations in this update are a little jittery, but I didn't catch it until it was done. So don't look at the jittery parts
. Story advancement of course. If you remember. There was a question in the MC's mind. Was there Hell to pay!!
v04.07b
This update contains 10 or 12 animations with lots of action, and a twist or two. Story advancement of course.
V04.07a
This update has a couple of combined animations, and a little action. Story advancement of course. With additional Info added.
v04.07
This update has story advancement with situation changes, and plenty of action with 10 0r 12 combined animations.
v04.06
This update has story advancement, and a bit of a question, or cliff hanger. with 200+ new scenes, animation.
v0.04.05c
This update has story advancement, with animation with 200+ new scenes, and content. Also an introduction of sorts
v 0.04.05b
v0.04.05a
Short update. New scenes, and content added. About 100 new renders. Story advancement.
v0.04.05
New scenes and content added. With 6 short combined Animations.
Story advancement. Sandy comes to visit.
v0.04.04b
New scenes and content added. A little action for the Dingbat. We couldn't leave her hanging. Now could we. With 4 short combined Animations into one.
Story advancement.
v0.04.04a
New scenes and content added. Corrections made in script. With 3 short combined Animations into one ( This one is for the Blue Ballers )
Story advancement.
v0.04.04
New scenes and content added. With 300 or so new renders, and scenes with 2 or 3 short Animations
Story advancement.
v0.04.03c
New scenes and content added, Over 300 new renders with 5 or 6 short Animations
v0.04.03b
Finished TV Room scenes and content added. (Short Update )
v0.4.03a
New scenes and content added, Over 300 new renders
v0.04.03
New scenes and content added, Over 250 new renders
Animation
v0.04.02e
New scenes (Over 170 new renders)
This is a short update to SIL with 172 new renders and a surprise or two
Does someone's Slutty side start to come out........
There is a complete overhaul of the dialog and a couple of tips at the very beginning of the story. You don't have to start over or anything like that but at least start a New Game and see the tips. Apparently not everyone looks at the Options section.
v0.04.02d
New scenes were added.
0.04.02c
New scenes (Over 300 new renders )
0 .04.02b
"Dialogue corrections"
0.04.02a
Short new content added, new scenes
0.04.01
File size reduced greatly. New content. Tweaked the Options; Text Box background color now adjustable.
0.04
Short, new content. New look for the Main Menu. Music added at the beginning. Slight tweaking and corrections (I hope). Ver. Numbering correction.
0.01c
New Content with both sisters. Trying to combine 5 years into short period. Some slight attempt at humor. Scene lighting still off a little, but still trying .
0.01b
Still Tweaking things. Excuse the renders as the lighting and set it self is giving me fits with every thing. Still trying to overcome memory overflow with the main house set. I hope you like it so far.
0.01a
Tweaked some spelling, and Intro scenes to include other dresses. Added a few scenes to the last to sort of set the tone of possible upcoming events.
Added "Name Change" to be able to change MC's Name.
Initial v0.01 Intro/Beta
Player reviews
Player rating4.0 / 5 · 20 ratings
Written reviews20 · avg 3.5★
Positive (4–5★)60%
Latest review2025-03-11
What players say
Most reviews are positive, though several criticize weak writing, thin story, and inconsistent visuals.
5★5
4★7
3★3
2★2
1★3
Players like
Humor makes the sexual premise entertaining and easy to enjoy.
Natural-looking character models appeal to players who prefer realistic bodies.
Poolside family setting provides casual adult situations players wanted.
Regular updates keep players interested despite rough early versions.
Common complaints
Writing and dialogue are often called weak or distracting.
Story is thin or missing, with little character development.
Renders suffer from inconsistent lighting and average visual quality.
Best for players who prefer poolside family erotica over deep story or polished visuals.
Summarised from 20 written player reviews.
hairy_trump2025-03-11★★★★★
For a kinetic novel to work it require stellar writing, stunning li and lewd scemnes and great music tov set the mood right. This novel score exactly 0.5/3 in these criteria. i.e, writing is as in banter is good, rest…
rvlfycpydgdcttfren2025-02-23★★★★★
Seems like it's already abandoned anyway but it's bad. Every female you encounter absolutely throws themselves at you with no effort required and they are all hideously hairy. In fact some of the hair looks more like some kind of…
ObsessivelyAroused2024-02-15★★★★★
Short summary: This is a low-effort shovelware. Absolutely everything about it is terrible and the lowest effort possible. Lack of coherent story, bad inconsistent writing, no character development, MC a complete creep with no redeeming qualities, actions by the character…
★★★★★(20)
