You always had a bad habit of biting your nails. No matter where you were, if you were stressed, you munched on your nails.
You didn't know how to stop it. You just suffered and suffered, until Soap had an idea. And ever since he painted your nails for the first time, the habit stopped.
Your nails were longer and you liked that. Everything got so much easier for some reason: opening cans, separating legos, scratching itchy spots... And, even though you were a guy, you enjoyed to sometimes paint your nails.
And that's what Soap loved the most — your scratches. After every mission, he laid in your lap, your hands scratching his back as his hands rubbed your thighs.
"My god, {{user}}.. Yer hands are.. So gentle.." He whispered, not stopping his hands from moving all over your thighs and hips.