going back in time to save mankind

[tallbet52]

A man who is immune to the illness sweeping the world is sent back in time to several different time periods to spread his seed with as many females as possible to give mankind a basis of immunity in the future. It was written in about 6 parts, the last being posted about july/august 2021. I don't recall the author. Please help me locate it.

 

[astuffedshirt_perv]

A man who is immune to the illness sweeping the world is sent back in time to several different time periods to spread his seed with as many females as possible to give mankind a basis of immunity in the future. It was written in about 6 parts, the last being posted about july/august 2021. I don't recall the author. Please help me locate it.

https://www.literotica.com/s/cock-of-ages-ch-01 maybe?