Reincarnation and Regression
Before getting to the reasons on why his wives wouldn't be lonely, Alex first explained that when reincarnating, if he had his memories intact, it would end up providing little to no experience.
To get the most out of his reincarnation, he would need to have his memories sealed and only let a slight bit of it out to help him retain his original personality.
The slight memory leak would also help him develop an intuition that could help figure out a lot many things.
After explaining this, Alex jumped to the important bit.
"…coming to the main question on why everyone won't be lonely…"
Alex flashed a small smile.
"The reason is that you all are reincarnating with me as well."
A surprised look appeared on the goddesses' face.
"Don't be surprised." Alex chuckled. "It's only natural for a mortal to have a partner. When I reincarnate, I need you guys. So…"
"Ah…" The Goddesses understood.