Hmm, it would not be good for him to also consume the blood of "grand red (jasmine)", so that his lineage increases further, since "ophis" is infinite and "jasmine" is "dream". I like the rings.
List of possibility...no maid due to having kid and married :(
Kuroka-Kalawarner-Akeno-Koneko-
Xenovia-Rias-Yasaka-Tiamat-Rossweisse-Raynare-Ingvild & Katerea Leviathan
Good chapter, funny, I liked the thing about jasmin, it would be great to see more jokes like that or scenes where he makes jokes that others do not understand. Something like "look Jack frost came to say hello" when he sees Vali
if i were to say who gets a ring rias for one half dragon half gremory sounds pretty bad awsome, for others may be raynard or some of the other fallen angels. But this is your story so its mainly up to you who gets added to the harem