I've had these silly "cactus vines" I call them, all over the front yard for years and I mean like 20 years. A couple of them have bloomed a couple times, they are pretty spectacular but only last a day or two. The flower is similar to the night blooming ceres. Well this plant bloomed 2 flowers while we were on vacation and proceed to fruit afterwards!
Can hardly believe they got a fruit after all these years.
They are hefty fruits, I'll let you know what they look like inside after I cut them.

- Twa dragonfruits