>>8558take it from another girl into ballbusting: no. a million times no.
do not fuck around with rubber bands. it's dangerous. the crusher plates are actually safer.
that being said, if you're asking if this question you aren't ready to use hardcore equipment.
if you want to tie off his testicles and emphasize their appearance and availability there are options specifically designed for safe use on
humans. ball stretchers are a popular option. poke around bdsm stores, especially gay bdsm stores (for example, nsfw link:
https://shop.oxballs.com/BALLSTRETCHERS_c91.htm), and you'll find a lot of accessories designed for balls. for now, stick to ones that are small and light. they also have the effect of delaying orgasm, which is nice if you're into that.