Does she know that Sasha is you slave? Because she needs to see that sasha is your slave, that will get her interested in the idea of being your slave. The scene happens when Sasha is a slave and around lexi.
For Slave Lexi:
LP
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75+
KP
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25+
Slave Sasha
Go to clothing store when both are there.
KP
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max set to 50
Get KP
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to 50
Lexi offers herself to you
KP
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max set to 75
Get KP
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to 75
Offer Lexi Collar