You felt a feeling came along, and with enough time as a female House Fly, you quickly figured it out that you about to lay eggs. Moving quickly in front of the mirror, you prepared for the show. You braced in front of your reflection and "aimed" your ovipositor at some imaginary spot.
Like many experiences that just came, this was weird but pleasurable. A white object was sliding out the thin end of your ovipositor, and the whole way through it was rubbing you in all the right ways. You had another expressionless orgasm when you felt it was only halfway through, but you mustered some willpower to continuing laying it. It popped out quickly with the last push, and soon there was rice-grain-looking object on the floor that you took to be a fly egg. You felt that more would be coming.
Every egg was a blissful moment, if just physically, but you were laying so many that you quickly got use to it and even started experimenting. Just shooting them out. Pushing and pulling them in and out like a psuedo fucking. Kind of bunching them up and laying a few at once. You even had Samantha participate by pulling a few out, as best as she could with Fly limbs anyways. You even tried the same yourself with your back legs for some back and forth action.
Soon you felt done with a decent pile of eggs behind you, total'd to half your size. Remember some of the info before trabsforming, House Flies could lay hundreds, maybe up to a thousand eggs in their lifetime, although that wasn't saying much. They tried to do it all over the course of a few days. However, you did tweaks to your form so not only could you lay eggs as long as you were alive, but your overall reproduction was on overdrive. Samantha's semen or not, you still felt that you could lay plenty more eggs at-will even after this session, but you felt the eggs would come out sooner or later if you didn't make the effort to lay them yourself. To emphasize the issue, you laid one more egg just because you could. With the tweaks you made, any semen from a House Fly would immediately make you filled to the brim with ready-to-lay eggs, which you figured just happened from the recent Fly Sex.