I agree that that scene can be done without it. Based on the spoilers that I have seen, I think the author is trying to show that Fei and Mikhail with some commonality with the aftermath of confronting a family member. They are trying to 'lick each other wounds' sort of speak, but sex isn't the answer to everything.
At the same time, it's pushing the Fei x Mikhail ship a bit more. Personally, i am a bit disappointed because i would like to see Fei and Yoh more. I wonder why bother bring Yoh into the picture if he'll get discarded later. (I digress)
yes... yes... yes... I also love the honesty connection between Yoh and Fei, so I thought their story ended after Finder no Rakuin, but what? Yoh is here. please don't give us (Fei x Yoh shipper) hope ┗( T﹏T )┛.
I agree with your point, they just can talk. I think the author made a slow path for MCs, which is... tiresome.
I knew it's Yamane Ayano's decision for this, but I am just curious with the ending
honestly, I don't need MikxFei rn because I want to know what happened to all MC, and... 10 years is too long for an arc. ( ̄ε(# ̄)Σ