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.