This prince made the D-Tier villain mistake of gloating before he won. Now he has no excuse. He could've kept his cushy life if he was only smart enough to do this all from the shadows.
That last page. After she calls out a Japanese name and speaks in what I'm assuming is Japanese. His reaction is "She didn't fall for me, but something inside me."
That something inside him could easily be someone's soul. I don't think it's that far of a leap considering how the chapter ended.
And by "Your mother will take care of it" she really means, "Your mother will make a fool of herself and our family name. Possibly to the point of losing our nobility."
I read a good bit of this web novel a while back. I had no idea this got a manga. It makes me want to pick the web novel back up. I always got a good laugh out of the MC that has nothing but Yuri on the brain, and accidentally ending up as the man sandwiching himself between yuri by his acctions.
The only real question here is what is going to make her fall in love with Cross. We all know the Cross is going to catch that Phantom Thief's eye somehow.
I'm looking forward to seeing Ares' face when he realizes that his "baggage carrier" is personal friends with the king. The silhouette in the previous chapter made it pretty obvious that's who MC was referring to.