well you should start with a shower but...
i would advise you to buy some massage oil and... having an excuse of getting her naked... and massaging her, even with your hard on, pretend you do not wanna eat her out...
then, flip it around and TELL her to massage you - remember do not ask - DO.
that's when the shower part comes in handy

as your parts will be clean so she can do her mastery work
fisrt the massage.. then she blows...
if you can, try some chocolate scent oils or strawberry...
this has a double impact as she will always associate the scent of chocolate to your "massage therapy"
keep us posted!
regards
Jesus
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Wanna know why girls call me Jesus?
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everyone should know this:
common-mistakes-of-men-who-call-themsel ... 20864.html