I agree with leelou's correction "feeling butterflies" rather than "feeling like butterflies."
As far as your choices, we should make some grammatical changes for each one:
Wishing that this splendid kiss *would never end*. (It implies that you know that it will end, but you don't want it to. It's the most emotional choice here.)
Expecting that this kiss *will never end*. (You actually think that it will last forever. You could use it metaphorically, meaning that of course you know that the kiss will end, but your feelings for the person will not.)
Wanting *this kiss to never end*. (You don't want it to end! It might end or it might not, but you don't want it to.)