fwbs or...fling?

ive never really had an ongoing fwb. i finally wound up hooking up with someone i work with that i enjoy sexually and would like to continue playing around with.

its just....i dont want to be the one hitting him up? im so stubborn. its not like he never invites me over of his own accord but the times that he doesnt or im not working, if i want to hook up, i have to ask him. and i dont like being put in the position where he can not respond or say no. like he did TONIGHT. i left work at 11:30, texted him seeing what he was doing at 2am. when he left he said he was gonna watch stranger things. either he fell asleep or he ignored me. fml