In a dimly lit dungeon, a stern mistress trains her new bisexual slave, eager to transform them into a proficient cocksucker. She begins with a lesson in gay-fantasy, presenting the slave with a realistic dildo, demanding they service it like a real cock. The slave, nervous but eager, takes the toy into their mouth, gagging at first but soon finding rhythm. The mistress watches, critiquing and encouraging, her own arousal evident as she strokes herself, ready to move onto the next lesson in their BDSM journey.