Clitoral stimulation

I have a hard time finishing while having sex with my boyfriend through penetration alone. My man is a bigger guy & I'm a curvy girl, there's no room in between us for toys or finger play to stimulate my clit during sex. We have tried a cock ring to try to stimulate my clit, but it didn't do much for me. I'm looking into trying lube next. Does anyone recommend a specific lube you've used that works to stimulate your clit & help you finish during sex? I really want to enjoy sex with my boyfriend, what we have is great but not being able to finish can be frustrating. Any tips, suggestions, advice is appreciated! Thanks! 😊