Passion flower/fruit question

Passion flower/fruit question

I was overjoyed when one of my passion flowers (bat-winged one, pictures under the cut) formed it's first fruit. It was completely unexpected, because I grow them under very unfavorable conditions - weather is much too cold and over winter I can only bring them inside the house, where they don't get enough light. Anyway, now I would really like to see this fruit (well, there are a couple by now and flowers are still blooming) mature if it's possible, so I could get seeds from it though I don't know if they would germinate... anyone knows my chances?).

So I'm hoping someone here has some experience with growing passion fruits (of this sort of passion plant or any other kind - I would be very grateful for any help). Things I want to know the most are of course what I need to avoid for the fruit to stay on the plant and not fall of green and what is the approximate time for such fruit to mature. As I said before, any advice would be most welcome.

My first place

My first place

Monster gourd

Monster gourd

tulip forming bulb above ground?

tulip forming bulb above ground?

Coltsfoot?

Coltsfoot?

An Amazing Little Tree

An Amazing Little Tree

Aerogardening in the cold of winter

Aerogardening in the cold of winter