While playing new version, somehow I got stuck on inviting sister to picnic. I checked walkthru and the post, there is no clear answer to this. I see many ppl are asking the same damn question... I mean sister is a requirement for mom's full husband then threesome. Below are the steps from reading the actual code, it should open up the option for sure unless the author changed the logic. Hope it helps.:
some stats buildup to unlock sister's door, you know how to do. gift her one woman magazine, then complement -> up to 1000. for depravity, you can just tell her dirty jokes which will decrease her attitude, but you can make it up with complements and jokes. It will get you up to 400 I believe, if not just talk to her with a boner which will increase 10 each time.
1, 17 - 18, sister depravity>=400, check sister room to first meet alik
2, 19 - 23, at kitchen, ask sister about alik
3, 17 - 18, sister depravity>=400, spy alik make up with sister. spy at least 4 times. (it might only count once per day. So do it at 4 different days to be safe)
4, 12 - 16 at park, meet alik, tell him to fuck off. (you can also choose to help alik here for alt route)
5, invite her to a picnic is open now
No weekend day required. any day would work.
