My very first abduction was of a female Sim, at that time I had no mod to set for females to be impregnated. However, when I finally did have a male Sim abducted it was in my ancestral save. I was amused that my 6X great-grandfather was abducted. Since his wife had already given him their first two sons, I was a tad worried, but decided I'd just play it as it happened. I watched his belly, but nothing ever came of it.
In front of a witness:
https://i.imgur.com/7y3yFJV.jpg
Up, up and away, he goes:
https://i.imgur.com/r57vDHv.jpg
For a man who became a 'somebody' this is a rather undignified return: :p
https://i.imgur.com/A5zTcEX.jpg
I was playing Pinstar's Legacy Challenge, and my second generation Heir got abducted late one evening as he made his way home. He was a widower and had just allowed himself to get back to dating. He also came back without being impregnated. This did not spare his son, my Gen. 3 Heir, who ended up being adducted just as his wedding was about to take place. In my panic, I had the bride click on the wedding arch, which oddly, returned the groom toot-sweet. Then I was chastising myself that I had foiled great possibilities with said abduction. Nope. The couple got married, and she got preggars on their wedding night. When he started to 'gain' weight, I thought possibly he was being empathetic to her condition. Then it became apparent, he was preggars. I had them both listening to Alternative Music since I needed a male heir. I was disappointed when she gave birth to a daughter. I expected him to give birth on the same day, but it was several Sim hours later before he commenced his labor. He gave birth to twins! First, a girl. Again I was disappointed. But, the second twin was the required male offspring. The celestial twins were a lovely shade of lavender, which I hadn't seen in the game, prior.
I, too, have yet to see two abducted at the very same time. What fun!
I did just recently experience my very first emotional death in my game, which claimed two Sims, however. The husband went first. After realizing everybody was weeping over the death of her husband, the wife went hysterical and that's all she wrote!
Congratulations and have fun with it. I hope you get your little alien babies. The bassinet alone is very cool.