Assistant!AU Meeting Hank the way he had was something he would never forget, even if he tried to. The man was unusual to say the least, with that suit and surprisingly likable voice and gentleman attitude that made Billy rapidly follow him home and give up every shred of control. Thus, as he became his boss, the chemistry didn’t die out - it got stronger.
In fact, the two were in so many tense situations that their co-workers started making bets how long it would take them to be caught in Hank’s office screwing each other’s brains out. The answer was four weeks and three days.
In their journey from one-night stands to actual couple, they had some ups and downs, including fights over how much Hank works and how little time he has for Billy. In return, Billy tired to make him jealous once by flirting with a co-worker, and it earned him quite a heated make-out session in the lab.
They start spending much more time after visiting the carneval, and so Billy finds himself in Hank’s apartment, even if it’s only for a movie night. He still avoids Hank’s bedroom for the time being as they are working things out, because a mare sight of the bead brings back memories and has him excusing himself to go to the bathroom.
Once together, they rapidly become cuddlers, affectionate with one anotehr to the point of aweful, and Billy is too blind, too in love with Hank to ever notice or care. He makes sure to show his boyfriend how much he loves him, every day, because in the midst of all the fluff and romance, he is aware of Hank’s self-consciousness about his looks and thus makes sure to reassure him about it as often as he can.
To him looks are not important, but how Hank makes him feel, and that is wanted, protected, loved. So, he feels happy with him, happier than he had felt in a very, very long time. Sharing same interests and geeky humor is all the bigger bonus.