Bill certainly didn't mean to discount all that Dan had been through classifying him as interesting. All of that, the past, everything that kept him up at night and kept him alone was hidden under layers he'd put in place and it was more the presence of the layers and what he'd called The Shining that Bill found interesting. People tended to be straight forward, they didn't tend to try and so trying and Dan seeming to be so unaware of himself yeah it got him a little interested.
He looked kind of scared, but murmur or not that was a yes and Bill smiled. "Brilliant," he said on the exhale as he tilted his head back a little more. It only seemed fair and Bill let his guard down just a little, because Dan always seemed to be searching and reading people around him even if it wasn't intentional.
If Dan was going to let him kiss him, then Bill could let him closer. It was a soft kiss at first because it was Valentines Day not closing time at some filthy nightclub but as Bill lay his hand on Dan's lower back it was impossible not to bring him in closer and tempt his mouth open against his own.