I see my petite 19yo stepsister taking nudies of herself.She teases me and wants to suck my big cock.She fingers her pussy before she rides me

I see my petite 19yo blonde stepsister taking nudies of herself.She teases me and says she does it because Im to chicken to ask her to suck my big cock.After she gave me a blowjob she fingers her pussy to make herself wet so she can ride on my dick