There is nothing you can do that I have not already done to myself

Dib's eyes went wide briefly with how tight Sollux was, and he let out a loud moan, one hand moving to join Sollux's in tangling with his bulges, finding all of his friend's sensitive spots that he'd memorized, while he let Sollux set the pace, following suit with careful rolls of his hips, his other hand running up to guide Sollux down onto him with each upward thrust. He watched Sollux's expression for any change or pain.