did he got hard for hes friend..?

I think it's because "his friend" sucked his blood. Its a normal reaction.

friend?? if you're talking about Wren, then no. I'm pretty sure vampires in this have aphrodisiacs in their bites.

Ohhhh yeah I remember that… xd so he can still seduce hes adopted child hahahaha (╯°Д °)╯╧╧ this is making me stressed now