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I teach the slave how to fuck men's asses, to become bisexual, using a silicone ass. He's tried many times, but his cock doesn't want a fake ass; it wants to fuck real ones, so he can't even get an erection! I get pissed off, humiliate his lack of virility, and punish him with hard slaps on his cock. Finally, I order him to go out into the street and fuck everyone he meets, with video evidence. He mustn't disappoint me again!