New tips for uncircumcised

My boyfriend is uncircumcised and he’s been gone on vacation for two weeks. We haven’t had sex in a good while and I usually do a really good job with a mix of handjob/blowjob, but I want to do something new that will really blow his mind and cause him a really good time. I’m limited to some things though because since he’s uncircumcised he has more nerve endings and just light stuff with tongue feels a lot and if you suck at all it’s immediate pain.