A step parent, either male or female, whom weds someone that has children from a prior failed relationship. The "stepsucker" provides shelter, clothing, food, financial support, stability, etc., etc. to stepchildren that always take yet do not give and are more than willing to live off of someone they resent and have no respect for. The "stepsucker" is permitted the obligation of having to help raise the children but are not allowed to discipline them. Any step parent that is called dad or mom by loving appreciative children is exempt from this definition.
After opening the big expensive presents and tossing the wrapping paper onto the floor the children were asked by their step parent to please pick up the trash and put it in the bin to which the step children replied, " You can't tell us what to do your not our real parent, your just the stepsucker, LOL"
Similar to a bootlicker, this is an individual who has a vested and extracurricular interest in submitting to authority, specifically the united states government (i.e. uncle Sam). They are the type to get ass-raped and further submit to humiliation by sucking off the bloody cock.
Elon Musk talks a big game against the SEC but his company's subsidies, engagement with cancel culture, and requests for regulation make him more of a samsucker by his actions.