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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 | 18% |
| Wife Role | 16% |
| Boobjob Engages in (Sexual) | 16% |
| Younger Sister Role | 14% |
| Infidelity Engages in | 14% |
| Doggy Style Subject of (Sexual) | 14% |
| Husband Role | 14% |
| Quickie Fix Subject of (Sexual) | 14% |
| Cowgirl Subject of (Sexual) | 13% |
| Standing Sex Subject of (Sexual) | 13% |
| Naked Apron Clothes | 13% |
| Skirt Clothes | 13% |
| Older Sister Role | 13% |
| Sitting Sex Subject of (Sexual) | 12% |
| Ponytail Hair | 12% |
| Sixty-nine Engages in (Sexual) | 12% |
| Blowjob Engages in (Sexual) | 12% |
| Bathroom Sex Engages in (Sexual) | 12% |
| Younger Brother Role | 12% |