User blog comment:DeathGodPrayer/Talk About What You Want!/@comment-3965848-20140421215431/@comment-24468758-20140422183137

It's near impossible for the next host of the BG to be Issei's child.

Regarding the birth issue:

1. Especially pure-blood devils have low birth-rates and only Rias and Ravel are pure-bloods.

2. Nekomata are in control of their mating season so they can bear children whenever they want.

3. Most of the girls have human blood, so they will be quite much more fertile than normal devils.

4. It's ISSEI. Does anyone think that ISSEI wouldn't have at least one or two children with each of the girls? He is perverted and has several thousand years to achieve this. Any questions left?