Shoulders aren't broad enough for Leon. Based on the build, the only guys I think it could be would be MC or Brown's son. We haven't seen Brown's son yet, so we don't know his size, however, the figure's right hand is raised up to his face suggesting he is either scratching his head (awkward pose) or taking a picture. His left arm is a.) either raised in front of his face, helping hold the camera, or, b.) lowered and rubbing his cock. (most likely given the slight impression of an elbow bend in the silhouette)
If either case I think it's most likely Brown's son watching, (and possibly documenting, but most likely getting off to) Clara getting bizy with Daddy.