Is that what I think it is in her panties?

To be honest, I thought the hem of her dress was a tentacle. But my eyes roamed right and I saw it..

Merri Said:
比那名居はその昔は「ひななし」と呼ばれ、雛無し、つまり女の子が生まれない家系として有名であり、地子にちnこが生えているのも当然であった。しかし本人は可愛い容姿が勿体ないと感じており、天人になる際に男の娘デビューを果たし天子と名を改めて世界へと羽ばたいたのである。っていう噂ウサ

On his Pixiv page. I'm not sure if he's alluding to Tenshi being a trap or a futa.

The source is tagged as Trap and not Futanari.

Merri said:
The Hinanai were known long ago as the "Hinanashi" -- that is, "Hina nashi" (TN: lit. "no dolls") -- and were famed as a family line that produced no girls, so it's only natural that Chiko would have a pOnOs. (TN: pun here between Chiko, Tenshi's pre-ascension name, and 'chinko', Japanese for 'dick'.)

But the person himself thought that it would be a shame to let his cute figure go to waste and decided to come out as a crossdresser once he became a celestial, flying back to the world once again under the name Tenshi.

Or at least that's the rumor-usa~

I knew it. I damn knew. There are no female angels in canon.