A funny thing happened here.  I went to try to insert the Big Mac blossom into the foliage of Hoya curtisii, and low and behold, what do I discover but three buds developing on H. curtisii.  I waited a long, long time to get my first curtisii flowers, but now will have flowered the plant in 3 consecutive years.

Hoya macgillivrayi and Hoya curtisii – Note the 3 H. curtisii buds in the 2:00 position.