I like to play with clothespins with him, most often while I’m teasing him with my mouth, body, hands.
In this particular case, I believe it was more innocent. I clasped the clothespins on his side, straddled his hips, and massaged his back. I made my thighs dug in extra hard at times, hurting my own skin the process of torturing him with the little wooden clamps.
*apparently UK people call this a peg