A man who dates a woman that has children by another man. The man is the boyfriend to the mother of the children and thus a Step Boyfriend to the children.
The children left their Dad's house to go visit their Mom and Step Boyfriend for the weekend.
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A guy that isn't your boyfriend but talks to you like a boyfriend would.
"Me and Tristan have been talking, but we aren't official"
"So he's like a step boyfriend?"