Options for couples during piv

Recently I was buying toys for mutual masturbation with my partner and I stumbled across a toy meant to be worn during piv to stimulate both partners in their respective erogenous zones. I didn't know these existed so I did a little digging and there is a whole market! So that brings me to y'all - can you please recommend some toys for couples that can be used in piv intercourse?

My boyfriend enjoys both taint stimulation as well as prostate and I believe he would enjoy ball stimulation as well. He is very well endowed, about 10" and girthy though idk exact girth. That being said, anything meant to co-exist inside the vaginal canal with him would just be painful for both of us so nothing like that. We also don't like anything spiky and I saw a lot of the options had little spikes(?) on them, i'm guessing to stimulate but we would like to avoid anything of that nature. Any toy that is just for one party but works cohesively with piv is also welcome! Please let me know any recommendations, I feel lost wading through all these options.