The Duck and Cover
Slather up your chest with a shit-ton of aloe vera and get on your knees behind your partner. Your chest and torso will be cool and protected while the rest of your body enjoys the party. A strong-ass vibrator between your partner's legs is an excellent distraction.
Doggy and missionary will put you both in a world of (new) hurt, so have your partner take a seat on a kitchen counter or barstool to connect the good throbby bits while avoiding the bad. Grab on to each other’s asses (no hands go beyond the upper butt!) to pull yourselves deeper and closer.
Don’t Feel the Burn
Time for oral. Incredibly careful oral. Have your partner perch on the very edge of a chair (because the thighs, they burn!) while you carefully apply the magical healing powers of mouth to groin. The circumstances aren’t ideal, but having the only body-to-body contact be between your legs will focus your attention there extra.
The Arm-ie Hammer
Try reverse cowgirl in a cushy armchair. Have your partner sit on your lap, then pump away, keeping their burnt arms safely out of the danger zone. If they don’t have superstrong thighs, they can use the chair’s arms for leverage and bonus thrusting power.
The Stay the F Away
Get off with no skin-to-skin contact by claiming opposite ends of the couch. You can just get to it or make it more interesting by having your partner instruct you—and vice versa—e.g., “Now stroke slowly up and down until I tell you to stop.” Hot, but not in the sunburn-y way.