At this point any 25+ "hag" in that world, especially if Japanese pretty in nature and already an mom - would probably seek to join his harem, especially that with his dragon powers, he probably will be like that dude in a different manga - that has some perf king powers and can survive even fucking 1k succubus in one night to orgasms and thus full power meter from smexy.
As a side note: The sword girl is meh - still big tits (and if manga thought me anything her out-of-clothes size will be far bigger anyway) and short hair. So dude gone up to 7 MILFettes in his harem and still no petanko girl, and the only muscle-mommy one isn't in her prime any more (she had far more "detailed" abs and other muscles like thighs before (the retrospect to old times images shown that).