Keep in mind that he also got Balance Breaker using breasts. He did have to train with Tannin as well, but the catalyst he needed to actually get Balance Breaker still ended up being breasts (poking Rias' nipples). He can replenish his aura if he gets hit from a beam from Rias' breasts. He was healed by being submerged in a tank filled with breast milk mixed with a bit of Phoenix Tears after the first use of Dragon Deification. His serious power-ups also come mostly from breasts. What's your point?
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