- Type: Attribute / Visual
- Description: A pair of relatively identical looking siblings having sex with third person or each other. Likely to invoke the group and shimaidon tags.
- Notes: Does not count as incest unless the twins engage in sexual activities with each other. Clones do not qualify.
- Gender: If the twins are the of same gender the tag is placed in that respective namespace. If they are of different genders use misc:twins.
- Slave Tags: Female, Male, Misc