How to initiate a bj while he's asleep?

Lia

So my fwb says to just wake him up in the night when I'm ready for sex, he said I could just give him head buttttt I honestly don't know how to go about it because the one time I touched his flaccid dick it was just awkward for both of us. He's not easy to wake up either. Any advice? Also I'm still a newbie to sex so just tryin to get some experience