A little more shading for musculature, no need for bodybuilder contour lines. The ones you have is plenty enough. I’m saying this because you’re already using color.
Hands need work... like tendon lines to show tensing during orgasm.
Kudos for staying in bounds of ecchi (so far), but the bra should be pulled up... how could she go directly to cunnilingus? She’s got to get her in the mood first!