Haha, being unsure is one thing but offering a view as to what we are witnessing is another.
Unless it is a non Mika vampire certainly not the case that Yu is crying in fear. Yu was never afraid of Mika, he only had the well being of his dear someone at heart.
He is Not Afraid, he is scared Because Mika is badly enjured
And worried about poor sweet Mika... really now just brings all the more relief Mika was okay. I mean something really bad could have happened and if Yu was not switched on or had forsaken his friend as a vampire - not worth his time anymore like which can and does happen, then... Just hits home what a great person Yu is to see Mika for who he was on the inside!
Something being along the lines of dangers with Mika and Shinya where the latter was the one who attacked Mika, the very moment he finally regained Yu... truly horrible like nothing else 🙀
Is shinya a member of Hiragi family?
Yes and no. No because he's not blood related to them, yes because he was adopted by them.
So one q Is it possible for vampire to have seraph within them?
I believe they have to be experimented on as a human first (i.e., Mika) before becoming a vampire, so yes?
What Shinya had which was important is that he was considered a member, which turns out does count more than blood ties.
With Mika it may be a case that him being a vampire can subdue the seraph traits, kind of like what Asuramaru done when a seraph was stealing his Yu.
What do you think?