Changing positions

I know that we like to change up our sex position with our partner in bed. cause it can get boring doing it one style all the time. But u want him to have his orgasm as well as u want it too. So if u feel that your in the right position at the time to have a orgasm and he change up and u drop back on not cumin. What should u do? Cause when he cums and u don't it's hard for him to go again. u will have to wait a lil for him to go again if he can do it, other wise he may have to do something else and u may not want that done at the time. I just wants to know if changing position at the time u about to cum is good for him being please and u not being satisfied.