After some explaining, yes.

"What's going on is that I feel amazing, Master! I just got turned into something called a genie! A being that grants wishes!" Sothis grinned as she tilted her wispy hip, placing a hand on it. "Specifically, I'm a Sex Genie, which means the wishes I grant are sexual~!"

"...what?" Byleth asked, once again completely flatly. "...also, why are you calling me Master? That's... quite deferential for someone who was berating me not ten minutes ago."

"Well, Master, genies are very servile beings," Sothis replied, floating around to behind Byleth and placing her hands on his shoulders, and plastering herself to his back. "My very nature has been... elevated in a sense, altered. Believe me, the experience is so worth it... but yes, I am calling you Master, because now, I'm your ****, bound to obey your commands. But don't worry, I don't mind it at all! By my very nature, I desire to serve now... even if you are a bit of a dunce. Seriously, why did you think it was a good idea to get between that idiot with the axe and his target? You could have done any number of other actions, shout a warning, or move in with your blade to parry from the get go! Hell, even when I gave you the chance to redo it, you still did it wrong! Given your ability to see what was coming the second time around, you could have killed him instead of just deflecting his attack!"

"Defending clients is a rather important part of mercenary business. It's part of the job to put one's life on the line. I couldn't risk my father's reputation being tarnished by failing my task. Gien how quickly things were moving, there was no guarantee Edelgard would have reacted in time to a warning, and I couldn't judge whether I had enough time to properly parry until after I comitted to using my body to shield hers, while hoping my armor could deflect the cheap iron axe. It was a risk to my life, but a guarantee the client lived," Byleth explained why his first instinct was to do as he did. "When you turned back time for me, the reason I parried when I actually had time to respond instead of striking him down was because he was mid swing: killing him would not have stopped the axe's momentum. Hence a parry instead."

"...okay, fine, you're not as idiotic as I thought... just mildly idiotic," Sothis sighed. "You seriously think that old man cares about his reputation when compared to the life of his child? What kind of father do you think he is?"

"...well, at least you can still insult me. That's a sign that it's actually you, and not a completely brainwashed version," Byleth smirked.

"Heh! See, you know me so well already, Master!" Sothis snorted. "And was that a smirk I just saw? Guess you're not as emotionless as you seem! I think you and I are going to have a lot of fun together!" she added, floating off of his back and clapping her hands together gleefully.