One or more of the heroines is the protagonist's sister-in-law. Sister-in-law refers to the sister of protagonist's wife, or the wife of protagonist's brother. In rare instances it may also define the relationship between people who marry siblings and refer to the wife of protagonist's spouse's sibling.
| Name | Similarity |
|---|---|
| Sister-in-law Role | 35% |
| Brother-in-law Role | 17% |
| Wife Role | 16% |
| Boobjob Engages in (Sexual) | 15% |
| Younger Sister Role | 14% |
| Doggy Style Subject of (Sexual) | 13% |
| Older Sister Role | 13% |
| Quickie Fix Subject of (Sexual) | 13% |
| Naked Apron Clothes | 13% |
| Cowgirl Subject of (Sexual) | 13% |
| Standing Sex Subject of (Sexual) | 13% |
| Skirt Clothes | 13% |
| Infidelity Engages in | 12% |
| Husband Role | 12% |
| Miniskirt Clothes | 12% |
| Vaginal Fingering Subject of (Sexual) | 12% |
| Sitting Sex Subject of (Sexual) | 12% |
| Wedding Ring Clothes | 12% |
| Brown Hair | 12% |
| Bathroom Sex Engages in (Sexual) | 12% |