0I FOUND IT Arianna & Dasan NTR
if she just keep talking with dasan and nothing happening
1)go to inn haave drink with rick until he collapase
2)help hime and go to his home>his room
3)go to arianna room with kate( she is still following u )
4)have 3some & next day do the same thing .drop rick > 3some
5) 3rd or 4th day when having 3some you will have 3 option
6) choose blow job from arianna ( NOT KATE)
7) now arianna Corruption will increase ( 3 is enough)
8) now go to rumha village annd wait 7.am morning
9) she talks with dasan and make sure you allow this
10) next time they talk wait few seconds and she will give blowjob to dasan
11) after 2 or 3 days she will fuck dasan
its is not a bug .