Sorry for not replying sooner:

• Cock rings, both the comfy and the restrictive kinds like a ball separator
• Masturbation sleeves
• A vibrating wand that can be held against the penis or scrotum, or even something which attaches to his penis/scrotum
• Prostate toys
• Dildos? 😈

I know there’s way more, but these are just a few of the things that I enjoy.