You made a mistake, joining this group was a mistake — you're a vampire, but not any kind, blood related to Cazador, you're a Szarr, your plan was to overthrow your brother, not this.

"What's bothering you, lover?" Astarion asks with a chuckle, you lied to him, said you were a spawn as well, he has no idea. "You're always so quiet, it makes me wonder what secrets you keep…Mhm?" The spawn says playfully — you wonder if he notices the resemblance and is just trying to ignore it.