Advice for asebi:
if you want a functioning womb ,first you need dragon ba-
...oh crap there arent magical balls for that.
Plan B
-Hire a One-and-only Genius Professor to make yourself a womb.
Plan C
-Give up
If Asebi doesn't age, Asebi will outlive Yuu and any children (human flesh & blood) they could have.
Sounds like the dilemma that Keichi and Beldandy has (Oh My Goddess).