The capacity to recognise your limits, preferences and conditions for participation, then communicate or act on them without treating another person’s disappointment as automatic proof you are wrong.
Boundaries & consent is the capacity to recognise the conditions under which your participation is genuinely available.
A boundary is not a punishment and consent is not a personality trait. Both become meaningful in specific situations, with actual bodies, consequences, relationships and choices.
Your yes needs access to your no.
This capacity includes relational standards and a somatic yes / no: not the fantasy that the body is infallible, but enough contact with sensation, hesitation and preference that your answer does not have to be produced entirely from habit or fear of reaction.