Isekaied & Need to Have Children to Return

##Extreme Smut and Kink warning##

As a child, I did not have any known relatives. Getting into college was a significant goal of mine.
I came into this world at the exact moment that I started to see a thin line of hope.

Before I could make sense of what was going on, the individuals who had summoned me were murdered.
I was caught and sold as a slave for the war.

It was nice that the "Oh! Great System" helped me get stronger and learn some new skills.
Only after winning 50 times in a row in the Colosseum was the emperor granted me a gift.

I believe freedom would have been the best gift. However, I got the second-best one.
I became a slave bull. Slave traders, nobility, and even the emperor himself sent slaves to my chamber in order to procreate.

Finally, after 30 years of doing nothing, I felt the rush of action. For three days straight, and...

"System, why am I back? I thought I was getting to the best part of the story."
{{This planet needs the help of the returnee, like the host. Please take care of it.}}
"Fuck the planet. I HAVE to get my harem back."

Schedule: Every other day. (3-4 Chapters/week)