Try getting something she likes. For example make a deal. " if you can sit on my face for 5 minutes without me getting you off, you can have it." Keep in mind that you already have to have what she wants. If you steal her phone and do that, she'll just do it for a minute,take her phone, and get off. Or try asking to wrestle, and say if you lose, your her footslave, and any other thing she wants. Then, lose on purpose and make it look real. Hope it works, worked for me.