Since my Hoyas are mostly grown inside for nine months of the year and then in a small greenhouse for 3 months, I very seldom get a chance to have my flowers pollinated.  This is only the second time that it has happened and the first where I spotted the seed pod before it burst open.  I’m sure that some type of Moth was the pollinator, because my small tent greenhouse was full of them all summer long.  Here is the photo of my Hoya pubicalyx ‘Red Buttons’: