Wanting something and actually getting it were two very different things. Bast had been shy all his life, the quiet type. He often had to force himself out of his comfort zone, wear masks just to be able to socialize while hiding his true self from the world. It was probably why he'd gotten so good at being a vampire apart from the inability to stop drinking blood when it just tasted so good. But as a result of Bast having always hidden away his true self in the past before becoming a vampire, it was easy for him to hide his supernatural abilities in plain sight. He used it as a way to entice people into his music. No one wanted to be involved with a real vampire these days, but people were still curious about it. So he used this to both gain fame and hide at the same time.
The fact that he was both innocent and nefarious at the same time was a similar part of his personality. He'd never found the right person to really let his sexual imagination run wild with. He might have had all of these great ideas and desires, but he was always too shy to go about them with anyone he knew. Plus, he was afraid of not being able to stay in control and hurting them. Somehow, though, with Haru, things were different. What really changed the game for him was watching Haru's neck wound close up at the club. Maybe drinking all of his blood would kill him, but Haru could at least heal better than most, and that put Bast at ease too. He was also strong enough that he could also push Bast away from him if things got too bad.
Bast had to swallow hard when Haru touched his lips, cooed at him in a such a way that made him breathless. He'd barely touched him and already Bast was dying to have him. "Ah... yeah... you did. I'm sor-- uhm... heh...." Some part of the real Bast still lingered on the surface even if Haru's blood was having a strong influence on him, but Bast's real, shy personality appeared to be even stronger than that. "It... It does... It turns me on. But it's never been this strong. I've... never had such a strong desire like this." His eyes flicked from Haru's thumb in his mouth to Haru's eyes, blinking his own in rapid succession. He was afraid. He didn't want it to be like last time, how he'd lost control, but Haru was making it impossible for him to say no. He could smell Haru's blood just under the surface of the skin of his thumb, and it was driving him crazy.
So he had no choice but to bite. The first drop of Haru's blood on his tongue made him moan loudly, and his dick twitched in Haru's hand. Then, mostly unexpectedly, Haru began to do things to him that he'd never felt before, pain and pleasure all mixed together, making him whimper and moan and buck his hips up into Haru's hand. Was this what it was like to be with an incubus? Bast's hand moved from his hair to Haru's hand that had the thumb in his mouth, and he held it there as he sucked Haru's blood. What was giving him more of a headtrip whether the blood or the stimulation to his nipples or to his dick he didn't know. He was dizzy already but he wanted so much more. He didn't even care if he was dead by morning. He wanted everything Haru was giving him and more, and he wanted to give Haru everything in return. "Take it," he whispered breathlessly, tongue caressing his thumb as he slurped up Haru's blood. "Take me and take my energy. Take it all. I want you so bad."