A sexual situation in which the dominant partner in an onee-shota or onii-shota age difference relationship is the younger boy.
Posts reflecting a shotadom situation would show the boy penetrating, rather than being penetrated, when having sex. Non-H images will usually show him looking more confident or physically overpowering the older party, and may sometimes be linked with BDSM by having the older party be bound or kept on a leash. Many will also depict the boy as a power bottom.
The gender inversion of this is lolidom.